Check engine light is on

[Jlane]

Check engine light came on today. 2 codes in the ECU..........ECU1($FD00) and ECU2($FD20). This is exactly what i pulled up with my scanner. Car runs perfect, no modifications. The only thing i have done was unplug the exhaust valve but i did that Aug 29th and have put on 2500km since then. If these are in fact caused by the unplugged Valves i will clears the codes and carry on. The problem being i cant find any definition for these codes, can anyone help?


Jason

[Jlane]

Wow shocked no one has run across this or has any thoughts on it

[andru1313]

Do you have a vagcom or are you just using a obdII scanner? Hard to tell from the codes you posted.

[nesbit]

Wow shocked no one has run across this or has any thoughts on it

I did see one other post, and oddly I think he too was in Canada. Is the ECM software difference for Canada than US?

[Jlane]

Just a obd scanner

[macrs3]

Check engine light came on today. 2 codes in the ECU..........ECU1($FD00) and ECU2($FD20). This is exactly what i pulled up with my scanner. Car runs perfect, no modifications. The only thing i have done was unplug the exhaust valve but i did that Aug 29th and have put on 2500km since then. If these are in fact caused by the unplugged Valves i will clears the codes and carry on. The problem being i cant find any definition for these codes, can anyone help?


Jason


Figured I'd share my experience. I took possession of my RS3 in July, by end of August I had the MIL (malfunction indicator light) appear with no cause. I suspected it may be a sensor issue, checked the fuel cap, disconnected the battery, no luck.

I brought it into the dealer, and after four weeks (and numerous calls due to lack of updates), the MIL turned off and they deemed the vehicle ready for pickup. It was an incredibly frustrating experience, as they had to open a TAC and work with Audi to diagnose the issue. The dealer was horrible at keeping me in the loop, and I found myself calling them every few days for an update.

In the end, I got my vehicle back without the MIL. It's been a week and it hasn't returned. Here's hoping...

I figured I'd share the diagnostics in case anyone else experiences the same issue. It was described to me a fuel error at 85km/hr under 20% throttle. They were unable to recreate the issue. In the end it resolved on its own.

https://thumb.ibb.co/imFOqb/mil.jpg (https://ibb.co/imFOqb)

[Krillien]

I just got my second MIL after two weeks since my first one, fuel trim running too rich as well. It came on when I was around 80kmh at 3k rpm, light throttle on sport mode. Not sure what’s going on...

[Jlane]

I just got my second MIL after two weeks since my first one, fuel trim running too rich as well. It came on when I was around 80kmh at 3k rpm, light throttle on sport mode. Not sure what’s going on...
Curious to know what codes you found?

[Krillien]

I don't have a scanner so I don't know, but the first time I had it my dealer said it was fuel trim running too rich. The car is with them right now, so I'll probably have an update soon, I'm expecting the same code though.

When I took it in the first time, they asked if my trips were short in general, and NOT to baby the car too much. I've since been driving the car like I would normally and not babying it at all, but that obviously didn't fix the issue.

[Grexx]

I don't have a scanner so I don't know, but the first time I had it my dealer said it was fuel trim running too rich. The car is with them right now, so I'll probably have an update soon, I'm expecting the same code though.

When I took it in the first time, they asked if my trips were short in general, and NOT to baby the car too much. I've since been driving the car like I would normally and not babying it at all, but that obviously didn't fix the issue.

I have a Microcan if you're interested of scanning it. LMK

[Krillien]

I have a Microcan if you're interested of scanning it. LMK

Nice, if the dealer comes back to me with inconclusive results I'll definitely reach out to you. Thanks!

[Krillien]

Just a quick update - the dealer is opening up a TAC on my car, I’m assuming it’ll be awhile before they figure this out unfortunately. I’ll post any updates I get from them here for sure though.

[nesbit]

I don't have a scanner so I don't know, but the first time I had it my dealer said it was fuel trim running too rich. The car is with them right now, so I'll probably have an update soon, I'm expecting the same code though.

When I took it in the first time, they asked if my trips were short in general, and NOT to baby the car too much. I've since been driving the car like I would normally and not babying it at all, but that obviously didn't fix the issue.

Don't baby it? What nonsense is that. I've never been told I could get a CEL from how I drive a car. Sorry you're having trouble.

[Grexx]

Just a quick update - the dealer is opening up a TAC on my car, I’m assuming it’ll be awhile before they figure this out unfortunately. I’ll post any updates I get from them here for sure though.

Can you PM me the dealer if you don't mind?

[macrs3]

Just a quick update - the dealer is opening up a TAC on my car, I’m assuming it’ll be awhile before they figure this out unfortunately. I’ll post any updates I get from them here for sure though.

Good luck, keep us posted. It sounds like the exact issue I went through -- dealer opened a TAC, followed all of the diagnostics and eventually the light turned off on its own.

I'm somewhat relieved that I don't have a lemon, but also concerned that there's a more common issue that needs to be resolved.

[Krillien]

Dealer called me today and told me that I can pick my car back up. Somehow the MIL went away itself, much like macrs3.

They said that Audi Canada will further investigate this issue, and that they will keep my TAC open and will call me to bring my car in when needed. Looks like this is happening to quite a few cars, I guess we’ll have to wait and see.

Just for reference, for those of you getting this code, can you tell me what your build date is for your car?

[lalalaprise]

Check engine light came on today. 2 codes in the ECU..........ECU1($FD00) and ECU2($FD20). This is exactly what i pulled up with my scanner. Car runs perfect, no modifications. The only thing i have done was unplug the exhaust valve but i did that Aug 29th and have put on 2500km since then. If these are in fact caused by the unplugged Valves i will clears the codes and carry on. The problem being i cant find any definition for these codes, can anyone help?


Jason

Off topic slightly ...how did you find it sounded after you unplugged valves?

- - - Updated - - -


Dealer called me today and told me that I can pick my car back up. Somehow the MIL went away itself, much like macrs3.

They said that Audi Canada will further investigate this issue, and that they will keep my TAC open and will call me to bring my car in when needed. Looks like this is happening to quite a few cars, I guess we’ll have to wait and see.

Just for reference, for those of you getting this code, can you tell me what your build date is for your car?

Glad to hear it's fixed ... interesting. Stuff like this is making me wait on tuning my car.

[steve111b]

A question for those who have an MIL appearing. Are you using top tier gas 100% of the time?

[Krillien]

A question for those who have an MIL appearing. Are you using top tier gas 100% of the time?

I'm using 91 octane.

[steve111b]

I'm using 91 octane.

Top tier?

[Krillien]

Yes according their website. I only fuel up from coop

http://www.coopfuel.ca/wps/portal/crs/coop/fuel/consumer/detail/6bab6139-6af7-4510-8ec8-32d900432258

[nesbit]

http://www.toptiergas.com/

I use shell or exxon 93.

[macrs3]

91 for me, still haven't seen the MIL return after two weeks.

[WAF]

Yes according their website. I only fuel up from coop

http://www.coopfuel.ca/wps/portal/crs/coop/fuel/consumer/detail/6bab6139-6af7-4510-8ec8-32d900432258

Interesting i found on my previous modded A4 when i used the co-op gas it would run a lil rough and seemed to lack the power. Currently i run Shell 94 or Petro 94 they seem to run smoother and have a lil more jam. Also noticed my fuel mileage increase a lil. I'm interested in hearing other opinions on fuel producers.

[Jlane]

Check engine light came on today. 2 codes in the ECU..........ECU1($FD00) and ECU2($FD20). This is exactly what i pulled up with my scanner. Car runs perfect, no modifications. The only thing i have done was unplug the exhaust valve but i did that Aug 29th and have put on 2500km since then. If these are in fact caused by the unplugged Valves i will clears the codes and carry on. The problem being i cant find any definition for these codes, can anyone help?

Ok update to my first post after much searching was never able to get a definition for these codes, tried a different scanner today and found the P21f5 code like other are seeing. Anyone had a solution for this yet ??

Jason
Ok update to my first post after much searching was never able to get a definition for these codes, tried a different scanner today and found the P21f5 code like other are seeing. Anyone had a solution for this yet ??

Jason

[macrs3]

Ok update to my first post after much searching was never able to get a definition for these codes, tried a different scanner today and found the P21f5 code like other are seeing. Anyone had a solution for this yet ??

Jason

No solution on my end. MIL hasn't returned yet. It would be great to ensure people with these codes are bringing them into the dealer (even if there is no fix). Audi needs to be aware of the issue as it seems common enough at this point.

[macrs3]

Also of interest, it seems everyone experiencing this issue has been in Canada. Has anyone encountered an issue in the US?

[Krillien]

According to my dealer, Audi considers this a known issue. My TAC is still open right now, and I’ll be bringing my car in when my dealer contacts me. Failing that, I’ll reach out to them to see if Audi Canada has made any progress in getting to the bottom of this.

[Ducs_Of_Hazzard]

Interesting i found on my previous modded A4 when i used the co-op gas it would run a lil rough and seemed to lack the power. Currently i run Shell 94 or Petro 94 they seem to run smoother and have a lil more jam. Also noticed my fuel mileage increase a lil. I'm interested in hearing other opinions on fuel producers.

Hey WAF where do you find 94 Octane Shell fuel in Edmonton? I thought Shell’s Premium Fuel (Nitro+) was only 91 Octane.

Thanks

[jaro12]

According to my dealer, Audi considers this a known issue. My TAC is still open right now, and I’ll be bringing my car in when my dealer contacts me. Failing that, I’ll reach out to them to see if Audi Canada has made any progress in getting to the bottom of this.

Hi, I'm in the same situation CEL come on, took the car to the local Audi dealer scan shows the same codes, after the initial check light went off they book me for more checks on November 15, a week passed since the light was off no issues yet, please keep me posted on your open case (TAC) with Audi. I'm really curious if Audi will come up with a solution to this problem it is very annoying when you purchase a new car and something like this occurs, hopefully the fix is just a software update.

[timzcat]

My TT RS is sitting at the German port for over a month. I was told yesterday they are holding RS3 and TT RS at port with no reported day when they will be released.
We can guess that this is a bigger issue and they don't want to release more cars if there is a problem. Not sure what is worse, car with a CEL or no car at all.[rolleyes]

[Krillien]

My TT RS is sitting at the German port for over a month. I was told yesterday they are holding RS3 and TT RS at port with no reported day when they will be released.
We can guess that this is a bigger issue and they don't want to release more cars if there is a problem. Not sure what is worse, car with a CEL or no car at all.[rolleyes]

This is just based off of my limited knowledge, but the CEL we're getting comes from idle bank 1 for fuel running too rich. I've only ever had the CEL come on when I was driving my car, so there should be no reason that idle bank 1 is throwing codes. I'm suspecting this is a software issue.

[motopix]

My TT RS is sitting at the German port for over a month. I was told yesterday they are holding RS3 and TT RS at port with no reported day when they will be released.
We can guess that this is a bigger issue and they don't want to release more cars if there is a problem. Not sure what is worse, car with a CEL or no car at all.[rolleyes]


That must be torture. My car is supposed to be finished in the next week or two but they are projecting mid-to-end-of December delivery. Maybe that's the reason.
Hang tight!

[context.eax]

This is just based off of my limited knowledge, but the CEL we're getting comes from idle bank 1 for fuel running too rich. I've only ever had the CEL come on when I was driving my car, so there should be no reason that idle bank 1 is throwing codes. I'm suspecting this is a software issue.

If the car is running to rich the perhaps you could try logging lambda specified and actual over RPM and see if your AFR is what the ECU wants?

[Krillien]

If the car is running to rich the perhaps you could try logging lambda specified and actual over RPM and see if your AFR is what the ECU wants?

I have confirmed this with my dealership that my AFR during actual idle and test drives came back normal. I'm still waiting on Audi Canada for more information regarding this.

[timzcat]

That must be torture. My car is supposed to be finished in the next week or two but they are projecting mid-to-end-of December delivery. Maybe that's the reason.
Hang tight!

It is because I won't drive it in the crappy weather so by the time it arrives it will be December.

[skylineguv]

Just got a check engine light on the way home and a quick read with an OBD scanner (would have used ODBEleven, but it's so damned finicky connection wise) came up with the P21F5 code as noted in the diagnostics printout earlier in the thread.
Guess I'll be harassing the dealership when I get back from site [rolleyes]


According to my dealer, Audi considers this a known issue. My TAC is still open right now, and I’ll be bringing my car in when my dealer contacts me. Failing that, I’ll reach out to them to see if Audi Canada has made any progress in getting to the bottom of this.

Which dealer was working this for you Krillien? Not that it should matter if it's a known issue with Audi Canada.

[fastolsen]

Hi,

I know there's an update available for this fault codes: P21F500, P218700 and P21F800 all saying something about the fuel mixture too lean/Rich.. Ask Your dealer about a TPI :)

[Paul@SupremePower]

Hi,

I know there's an update available for this fault codes: P21F500, P218700 and P21F800 all saying something about the fuel mixture too lean/Rich.. Ask Your dealer about a TPI :)

I get this one too. Soft code no mil.

Bank 1 too rich off idle.

I didn’t know there was an update thanks!

[DOCEVG]

For clarity, does an MIL = a CEL? My guess is no. I'm on my first tank of gas (dealer supplied) and have an MIL. Called dealer who, after confirming it was yellow, rather than red, told me not to worry and that it would likely clear itself soon.
Obviously, am subscribed to thread.

[Paul@SupremePower]

For clarity, does an MIL = a CEL? My guess is no. I'm on my first tank of gas (dealer supplied) and have an MIL. Called dealer who, after confirming it was yellow, rather than red, told me not to worry and that it would likely clear itself soon.
Obviously, am subscribed to thread.


Yep same thing these days. There used to be a distinction years ago.

Malfunction Indicator Light = Check Engine Light

[Krillien]

Just got a check engine light on the way home and a quick read with an OBD scanner (would have used ODBEleven, but it's so damned finicky connection wise) came up with the P21F5 code as noted in the diagnostics printout earlier in the thread.
Guess I'll be harassing the dealership when I get back from site [rolleyes]



Which dealer was working this for you Krillien? Not that it should matter if it's a known issue with Audi Canada.

Royal oak Audi.

[Krillien]

Hi,

I know there's an update available for this fault codes: P21F500, P218700 and P21F800 all saying something about the fuel mixture too lean/Rich.. Ask Your dealer about a TPI :)

Hey thanks for the info, I just called my dealer to setup an appointment to see if the update can be applied to my car. Apparently updates like this aren’t available to all countries at the same time. Fingers crossed I can get this fixed though.

[Ducs_Of_Hazzard]

Royal oak Audi.

Who did you deal with there Krillien? I bought my Q7 off Vince Tran and found Royal Oak’s Customer Service to be way better than Glenmore Audi’s.

[Krillien]

Who did you deal with there Krillien? I bought my Q7 off Vince Tran and found Royal Oak’s Customer Service to be way better than Glenmore Audi’s.

Yep, Vince is the man! He sold me an S3 and then my RS3. Awesome guy.

[Krillien]

So I got an update from Royal Oak Audi - Canada does not have the update for fixing fault code P21F500.

[Paul@SupremePower]

So I got an update from Royal Oak Audi - Canada does not have the update for fixing fault code P21F500.

Did they give any reason for the DTC? Im hoping its strictly a coding/software issue on their end. Has this been addressed with an update outside of Canada ?

[Krillien]

Did they give any reason for the DTC? Im hoping its strictly a coding/software issue on their end. Has this been addressed with an update outside of Canada ?

Nothing more than their suspicion that the ECU isn't tuned correctly for north america, and given that I live in a high altitude (Calgary) it could throw AFR off. Nothing concrete.

It does look like an update is already available in Europe, based on fastolsen's post. Had to look up what TPI(technical product information) meant in North America, which is basically our version of the TSB.

[timzcat]

I'm hoping this was the cause of the port hold in Germany for the RS3 and TT RS produced in the last couple months. I hope there is a guy running around the lot updating the ECU so they can load my damn car. lol

[Paul@SupremePower]

Nothing more than their suspicion that the ECU isn't tuned correctly for north america, and given that I live in a high altitude (Calgary) it could throw AFR off. Nothing concrete.

It does look like an update is already available in Europe, based on fastolsen's post. Had to look up what TPI(technical product information) meant in North America, which is basically our version of the TSB.

Interesting. I range from sea level to 500 feet and have gotten this dtc several times over 3000 miles. Gah. Well as long as it’s a soft code for now I can deal with it until they sort it out.

[Paul@SupremePower]

Going in Friday for P21F5 bank 1 too rich off idle. See if there is a SW update.

[nesbit]

For clarity, does an MIL = a CEL? My guess is no. I'm on my first tank of gas (dealer supplied) and have an MIL. Called dealer who, after confirming it was yellow, rather than red, told me not to worry and that it would likely clear itself soon.
Obviously, am subscribed to thread.

In general they are used interchangeably, however MIL is more accurate since the code could come from the transmission as well. Either way that is a BS answer. At minimum they should scan it so they know what it is. I think this is the first MIL in the US.

[DOCEVG]

I think this is the first MIL in the US.

Dunno whether to be crushed or proud. My SA is researching issue; will report back with answer.
As I live at, and car is at, 7500 feet in elevation, I wonder if that is contributing to issue.

[Krillien]

At this point my dealer has reset my MIL 3 times already while we're waiting for a proper fix, I'm able to reproduce this code under the following circumstances:

- sport mode
- light throttle (<= 20%)
- approx. 3k rpm

My drive select is set to individual with all under Dynamic except Steering on Auto.

[Paul@SupremePower]

At this point my dealer has reset my MIL 3 times already while we're waiting for a proper fix, I'm able to reproduce this code under the following circumstances:

- sport mode
- light throttle (<= 20%)
- approx. 3k rpm

My drive select is set to individual with all under Dynamic except Steering on Auto.
So your throwing the too rich off idle code with a MIL?

[Paul@SupremePower]

Dunno whether to be crushed or proud. My SA is researching issue; will report back with answer.
As I live at, and car is at, 7500 feet in elevation, I wonder if that is contributing to issue.

I’m rarely over 300 feet and I get the code but no MIL.

[nesbit]

I’m rarely over 300 feet and I get the code but no MIL.

That usually means it's a pending code that will become a full code if the ECU confirms it. If can self clear before causing a live code.

[Krillien]

So your throwing the too rich off idle code with a MIL?

Yep

[Paul@SupremePower]

That usually means it's a pending code that will become a full code if the ECU confirms it. If can self clear before causing a live code.

I did get a MIL once with the code right after I picked the car up. Since then it’s been a soft code.
I gotta remember to check the fault frequency and reset counter before audi clears it to see what that says as a reference

[anthony0303]

Sadly my car is at the dealer for mil codes a well, sadly mine even went into limp mode. The dealer is saying fuel pump and it's of course not in stock! They are expecting part availability in 7-10 business days maybe from Germany. However I am still suspecting crap 93 has or they say it's 93. My car has 1034 miles on it.

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[Paul@SupremePower]

Sadly my car is at the dealer for mil codes a well, sadly mine even went into limp mode. The dealer is saying fuel pump and it's of course not in stock! They are expecting part availability in 7-10 business days maybe from Germany. However I am still suspecting crap 93 has or they say it's 93. My car has 1034 miles on it.

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For fucks sake. We’re you throwing the same too rich off idle code as everyone else?

[anthony0303]

For fucks sake. We’re you throwing the same too rich off idle code as everyone else?
I actually was lazy and didn't check the codes since the car is so new. I ran into this thread last night

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[Paul@SupremePower]

I actually was lazy and didn't check the codes since the car is so new. I ran into this thread last night

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Audi will have that info. If you could find out and post when you get her back that would be great.

[anthony0303]

Audi will have that info. If you could find out and post when you get her back that would be great.
Sure when I speak to them next. This has me a little irritated since now I'm worried what next and if doing anything to the car will allow them to void the warranty

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[Paul@SupremePower]

Sure when I speak to them next. This has me a little irritated since now I'm worried what next and if doing anything to the car will allow them to void the warranty

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Well it’s not uncommon for there to be issues on a “new” platform. Even though the RS3 is based on MQB the engine revisions on the new 5 are significant.

The DTC issue could just be a software bug and your bad fuel pump just a faulty part although VAG has a history for shitty fuel pumps. I don’t think there’s any reason to panic yet. Personally I won’t tune a new car until after at least 10,000 miles to give things time to work out. Something new like this maybe longer depending on what others in our community are experiencing.

[Paul@SupremePower]

Went to audi. The code cleared itself. They had no info on an update. Wait and see I guess.
In other news this dealership is looking to tune APR in the next year. This place has been open for a month and I’m told it’s the largest dealership in the country right now. It’s really nice. Super customer focused. Hawthorne audi in Westchester County ny.

[jaro12]

Took the Car to Audi dealer for the third time to clear fault code P21F500, (2058 kilometer on the car) this time dealer changed my oil and filter due to fuel in the oil, I wonder if anybody have the same issue, SA claims there was gas odor coming from the oil, this is very troubling gas in the oil, this can be very bad for the motor and the turbo.

[Paul@SupremePower]

Took the Car to Audi dealer for the third time to clear fault code P21F500, (2058 kilometer on the car) this time dealer changed my oil and filter due to fuel in the oil, I wonder if anybody have the same issue, SA claims there was gas odor coming from the oil, this is very troubling gas in the oil, this can be very bad for the motor and the turbo.

Did they give any possible causes? Rings, bad injector, fuel pressure?
Gas in oil and too rich code isn’t good.

[BaltimoreCaesar]

I'm wondering if one of your injectors failed and is dumping fuel in your cylinder.

[Paul@SupremePower]

I'm wondering if one of your injectors failed and is dumping fuel in your cylinder.

Yeah I had an issue on my mk6 gti with the injector being stuck open. It was pretty blatant, misfires and a bunch of codes. Could even smell the gas in the cabin. If this is happening to a less obvious extent here it could be worse if undiagnosed due to thinning engine oil.

[jaro12]

Car runs good no other coder beside P21F500, dealer run all kind of tests, check spark plugs and cylinder walls for ware no issue there, thy open TAC with Audi and told me to drive the car.

[Paul@SupremePower]

Car runs good no other coder beside P21F500, dealer run all kind of tests, check spark plugs and cylinder walls for ware no issue there, thy open TAC with Audi and told me to drive the car.

Ok that’s good news. Please post any additional info.

[RezaWrex]

Took the Car to Audi dealer for the third time to clear fault code P21F500, (2058 kilometer on the car) this time dealer changed my oil and filter due to fuel in the oil, I wonder if anybody have the same issue, SA claims there was gas odor coming from the oil, this is very troubling gas in the oil, this can be very bad for the motor and the turbo.

I have the exact same issue. Audi has had the car since yesterday and are saying it's good to go now. They changed oil and filter too saying there was fuel in the oil as well as the too rich trim code. Another Canadian here.

[jaro12]

Did the dealer open TAC with Audi for your car? This is not normal for all this cars having this kind of issues from new. (Fuel in the oil) I wonder how many other cars with P21F500 code have fuel in the oil.

[Potatohead_RS3]

I would have to see a report of an actual fuel dilution problem before I would be concerned. Sniffing the oil doesn't mean anything. In order for fuel to get into the crankcase, passing all the rings you would have a serious rough running issue and/or serious mechanical problem, which nobody seems to have.

[OE2]

ive fueled up my oil in 4mins of free revving on a brand new motor. I was running too rich/too much ignition advance. It's possible to very quickly mess dump fuel into the crank case via idle.

A secondary check would be to change your oil again after 500 miles or ASAP when the code appears again.

[Potatohead_RS3]

ive fueled up my oil in 4mins of free revving on a brand new motor. I was running too rich/too much ignition advance. It's possible to very quickly mess dump fuel into the crank case via idle.


On a modern fuel injected vehicle, it's really not, unless there is something mechanically broken, which would lead to heaps of other issues depending on what it is.

Did the tech with the 'smell test' mention if the oil was overfilled?

[RezaWrex]

Did the dealer open TAC with Audi for your car? This is not normal for all this cars having this kind of issues from new. (Fuel in the oil) I wonder how many other cars with P21F500 code have fuel in the oil.

My dealer did open a case with Audi Canada who is well aware of the issue apparently. My dealer had 2 other cars in at the same time for the same issue (both RS3 and TTRS). They have seen multiple other vehicles with the same issue as well. They say the instructions from Audi Canada are to clear the fault and if it returns they will replace the injectors (1-2 week wait as they have to order from Germany).

[IceAero]

I wonder if this will become a TSB.

It sounds like the type of thing that could effect all of us...

I'm tempted to run it by the dealer just to see if a pending code is present.

[Paul@SupremePower]

I wonder if this will become a TSB.

It sounds like the type of thing that could effect all of us...

I'm tempted to run it by the dealer just to see if a pending code is present.

Mine cleared last week. Just checked again and now it’s pending.

[nesbit]

I wonder if this will become a TSB.

It sounds like the type of thing that could effect all of us...

I'm tempted to run it by the dealer just to see if a pending code is present.

I can't believe so many cars are seeing this problem, yet Audi would not have seen it in testing??

[clubberlang06]

Sadly my car is at the dealer for mil codes a well, sadly mine even went into limp mode. The dealer is saying fuel pump and it's of course not in stock! They are expecting part availability in 7-10 business days maybe from Germany. However I am still suspecting crap 93 has or they say it's 93. My car has 1034 miles on it.

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Going into the dealer for the second time with this, the first time they just reset the code. Might have to replace the fuel pump this time I guess. Between two blown tires (separate incidents) and two drivetrain malfunctions in 1500 miles and four months, this car is making me nervous to even drive it...

[anthony0303]

Going into the dealer for the second time with this, the first time they just reset the code. Might have to replace the fuel pump this time I guess. Between two blown tires (separate incidents) and two drivetrain malfunctions in 1500 miles and four months, this car is making me nervous to even drive it...

I got my car back the day before, i picked up late enough the service desk wasn't open so i won't have the codes until i follow up with them. if they have replaced the pump the dealer will have kept the car several days. There's no parts in stock and it has to come from Germany. I would't worry too much about it and see how it goes . If you have more issues with it and it's the same thing just lemon law it. For everyone what the replaced was the high pressure pump not the low pressure. What's interesting about this is the first thing you will notice is the transmission gets laggy. I never had the motor studder or seem like it misfired.

[Paul@SupremePower]

I got my car back the day before, i picked up late enough the service desk wasn't open so i won't have the codes until i follow up with them. if they have replaced the pump the dealer will have kept the car several days. There's no parts in stock and it has to come from Germany. I would't worry too much about it and see how it goes . If you have more issues with it and it's the same thing just lemon law it. For everyone what the replaced was the high pressure pump not the low pressure. What's interesting about this is the first thing you will notice is the transmission gets laggy. I never had the motor studder or seem like it misfired.

They replaced you HP pump?

[anthony0303]

They replaced you HP pump?
Yes

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[anthony0303]

Yes

Sent from my Pixel 2 XL using Audizine mobile app (http://r.tapatalk.com/byo?rid=87676)
Additionally it went it to fault while idle and parked.

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[Paul@SupremePower]

Additionally it went it to fault while idle and parked.

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Did you have gas in your oil also? I dont think you posted that you did.

Well so much for this DTC issue being a software bug. Looking less and less likely. By itself this code isn’t too troubleing. Being paired will ppl reporting gas in the oil concerns me. Thinning oil is bad any time but during break in and the first 5000 Miles.... really no bueno.

Just did my first oil change at 4000. The service guy didn’t say anything but it’s something you could miss unless prompted to look for.

Bah.

[Krillien]

Additionally it went it to fault while idle and parked.

Sent from my Pixel 2 XL using Audizine mobile app (http://r.tapatalk.com/byo?rid=87676)

Hmm I don't think this is the same issue - at least for myself. My fault codes came up when the car is being driven.

[nesbit]

Did you have gas in your oil also? I dont think you posted that you did.

Well so much for this DTC issue being a software bug. Looking less and less likely. By itself this code isn’t too troubleing. Being paired will ppl reporting gas in the oil concerns me. Thinning oil is bad any time but during break in and the first 5000 Miles.... really no bueno.

Just did my first oil change at 4000. The service guy didn’t say anything but it’s something you could miss unless prompted to look for.

Bah.

Would it thin the oil or just vaporize off of it?

[Paul@SupremePower]

Would it thin the oil or just vaporize off of it?

Mix in and thin it. The same way you mix gas and oil in 2 stroke engines and they become one homogeneous fluid. In addition to lowering the viscosity gas is a solvent. Small amounts of gas would go unnoticed but the fact that they can smell it means it enough to be concerned.

[Paul@SupremePower]

So my pending too rich code advanced and my MIL turned on today. Going to dealer in morning again with riot act in hand.

[nesbit]

So my pending too rich code advanced and my MIL turned on today. Going to dealer in morning again with riot act in hand.

Are you using a generic OBDII scanner? I'd like to check mine. I think my scanner might be pretty old though.

[Paul@SupremePower]

Are you using a generic OBDII scanner? I'd like to check mine. I think my scanner might be pretty old though.

I have obd for easy on the fly checking but alway Use VCDS to dig deeper. Generic obd doesn’t give enough info usually.

[Paul@SupremePower]

Warmed up the car, took off the oil cap and took a smell. Absolutely REEKS of gasoline. Not like well maybe it smells a little but a strong odor of pure gas. Just had an oil change last week also.

Anyone with this code may want to take a whiff of their oil.

Have an appointment on Wednesday back at audi.

[nesbit]

I have obd for easy on the fly checking but alway Use VCDS to dig deeper. Generic obd doesn’t give enough info usually.

Tried to read codes with my old ACTRON 9135. Is key on enough or does the engine have to be running? The OBDII connector had a 1.0 on it. Could it be too old?

[Paul@SupremePower]

Tried to read codes with my old ACTRON 9135. Is key on enough or does the engine have to be running? The OBDII connector had a 1.0 on it. Could it be too old?

Key on should be enough for reading codes but if it doesn’t read you can have it running. I don’t know much about that connector but if the dongle is way older then the app it may not work due to software upgrades

[CJMRS3]

Any updates to this? I currently seem to be having the exact same issue... Canadian... too rich fuel code... already cleared once and now it's back on. First time dealer cleared it and now second time they didn't clear it and told me to watch it for a few days to see if it goes away. Is there a TSB from Audi Canada on this or anything I should reference to my dealer?

[SolarRS3]

Any updates to this? I currently seem to be having the exact same issue... Canadian... too rich fuel code... already cleared once and now it's back on. First time dealer cleared it and now second time they didn't clear it and told me to watch it for a few days to see if it goes away. Is there a TSB from Audi Canada on this or anything I should reference to my dealer?
A bit late but might help someone. I just got that code (p21f500) and dealer updated the ecu (as there is a tsb now in canada). Problem is gone and the car now as a more prononced exhaust in dynamic... Im happy haha

[Micronaught]

Can you post the Canadian Tsb number ?

[BaltimoreCaesar]

CEL came on for me this past Friday (exactly 1 year from the day I took delivery). P21F5 rich off idle code came up in generic OBD scan tool. Took to dealership, they said there is a TSB for this issue and that an ECU flash is the remedy. Picking car up tomorrow, and will smell oil prior to leaving dealership for gasoline odor. Car drove totally normal except for the CEL.

[mheins]

I have 2018 TT RS which I bought this summer. It was fine until cold weather set in, then I got the solid yellow engine light. Car felt normal to me as far as power & response. Took it in to the dealer who told me the code was "too rich bank 1", and updated the firmware per a TSB. Less than a week later, the light is back on, so going back to the dealer. I don't know what they'll do this time, but I hope it's more than just "clear the code & hope for the best". I do have a habit of putting it in sport mode when I drive, even though I'm not pushing it -- I just like the way it shifts that way; don't know if that has anything to do with it throwing the code.