PCV Valve Soft Codes after replacemenet

[vector78]

Hello team,


I have been experiencing a persistent soft code (P052E00) immediately after my PCV valve replacement going on for two years now on my 2015 Audi A7 3.0TSI.

After some forum research it seems like the issue is a stuck check valve which is part of the following 06E103207AP assembly. This could be due to it getting clogged/damaged as the original valve failed.

This doesn't appear to be an isolated problem so it could be beneficial to replace the 06E103207AP tube/valve assembly proactively during the PCV replacement to avoid this headache.

Has anyone else experienced this? Have you been able to clean/fix the tube valves or replacement is only option?




Thank you

[AudiC7Owners]

The exact same thing happened to me. Just replaced my pcv & still have the code.

Are you having oil consumption as well? I've read a bad check valve stuck open can result in similar symptoms as a bad pcv (oil consumption)

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[vector78]

LOL,


I just saw your post as i commented on your new PCV replacement thread. I have not swapped the new part yet as I have been busy with other projects and car has hardly been driven.

I am still having some oil burning but considering that these engines use low friction oil rings plus low viscosity oils some blow-by is to be expected in my opinion.

I am still curious if anyone else has had this tube replaced and if the soft code went away. I am APR tuned and when I called my shop they said I'm to the latest software revision and software should not have caused the code.

[Thomas@TAI-VW]

Those valves are a high failure item. You can splice it into the existing hardline,otherwise you have to remove the S/C to get to it.

[vector78]

Do you know if it is a simple check valve that can maybe be cleaned using solvents or replacing it is the only option?

I am thinking of spaying some throttle body cleaner into the upper hose tube and waiting to see if the code goes away.

My PCV red diaphragm failed (goose honk noise) so it likely sucked in gunk from there into that check valve.

[AudiC7Owners]

LOL,


I just saw your post as i commented on your new PCV replacement thread. I have not swapped the new part yet as I have been busy with other projects and car has hardly been driven.

I am still having some oil burning but considering that these engines use low friction oil rings plus low viscosity oils some blow-by is to be expected in my opinion.

I am still curious if anyone else has had this tube replaced and if the soft code went away. I am APR tuned and when I called my shop they said I'm to the latest software revision and software should not have caused the code.

I'm about to do this and I'll let you know

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[AudiC7Owners]

Update: I replaced my Check Valve breather tube and the soft code did indeed go away.

Still burning oil though :/

[Carnaval09]

Update: I replaced my Check Valve breather tube and the soft code did indeed go away.

Still burning oil though :/

Hello. Did you ever find out what was causing oil burn issues…? A few moths ago replaced PCV, valve cover gaskets, breather valve along with carbon cleaning and some other preventative parts while I was at it at 135k on my A6 3.0T and while there were no codes after replacing those parts I do see that oil burn rate is still about the same as before the replacement. Can’t seem to find anything else that might cause this oil consumption as there are no other visual signs I can think of. I’ve had the car since 33k miles, has been changing oil at around 6k and it has been a bullet proof beast that never needed anything. TIA.

[esimp2k]

Was at the dealer the other day and they advised they are starting to see oil consumption in high mileage 3.0t motors. Especially in the q7. The Audi factory tech told them marvel mystery oil with the next oil change and the next step would be to go with a lighter weight oil. To avoid a complete engine lit tear down. My a6 at 102k was burning lol. Had been through two failed pcv as well. Was eating a quart every few hundred miles stage 2 single pulley. Rolled the dice and added the marvel mystery oil. So far 1/8 quart down after 1400 miles. Worth a try.


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[Carnaval09]

Was at the dealer the other day and they advised they are starting to see oil consumption in high mileage 3.0t motors. Especially in the q7. The Audi factory tech told them marvel mystery oil with the next oil change and the next step would be to go with a lighter weight oil. To avoid a complete engine lit tear down. My a6 at 102k was burning lol. Had been through two failed pcv as well. Was eating a quart every few hundred miles stage 2 single pulley. Rolled the dice and added the marvel mystery oil. So far 1/8 quart down after 1400 miles. Worth a try.


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Hi! Thanks for info. Did the Audi tech mention the possible cause of the consumption? Is it due to stuck rings? I’m burning about a quart every 1600 miles using LM 5w-40. I read that failed/stuck injectors could also contribute to oil burning and now looking back I wish I pulled them to clean while I was doing Carbon Cleaning. Also, if I remember correctly from my Honda days, that sadly also burned oil, the Marvel to oil ratio was up to 20%. What are you running yours at now to see such a significant improvement in consumption? TIA

[esimp2k]

One quart with a fresh oil change. Didn't seem they have a concrete reason for the oil burning. Local tech said it could be a number of things. Rings was mentioned as I recall but not injectors. I typically don't feel great about Audis after 100k miles but that's just me. This certainly has been the most reliable out of the 5 we have owned however.


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[Carnaval09]

One quart with a fresh oil change. Didn't seem they have a concrete reason for the oil burning. Local tech said it could be a number of things. Rings was mentioned as I recall but not injectors. I typically don't feel great about Audis after 100k miles but that's just me. This certainly has been the most reliable out of the 5 we have owned however.


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Thanks. Well, out of my 4 Audis we currently have I have enough milage and years of ownership to speak about 3 which all have been wonderful cars. My wife's stage 1 2017 Q7 3.0T just hit over 100k and I'm getting ready to replace PCV, I'll keep an eye on what you said earlier about Q7s.
But back to my A6, I rescanned it and strangely enough I do see the intermittent P052E00 - PCV Regulator Valve Performance code now. I only put 3k miles on this car since I replaced those components so hard to believe something would fail that early unless I got a defective part. Was wondering if there is a quick and effective way to check the breather hose on 3.0T before taking everything apart again? People talking about high failure rate of this breather hose and if I were to replace it again after only 3k splicing it for a quick replacement would be definitely a way to go. I would take an entire PCV relocation route but the kit seems to be overpriced considering FCP Euro lifetime replacement and normal lifespan of the components.

[Haus]

We have the same garage. 2017 Q7. A6 Prestige (2014). And I just did the same work on my A6. PCV, gaskets, carbon cleaning, seals on injectors, but did not do the breather valve. Now I have the P052E00 also. Worse yet I need to SMOG and after couple hundred miles and many drive cycles readiness is a no go. Did you sort out the P052E00?

[Spitfire007]

I'm also seeing a LOT of oil consumption. About 2.5 quarts every 5000 miles.

2016 A6 stock 3.0T.
CREC so no carbon issues to speak of as far as I can tell.
I'm at 102k, so maybe it's time for PCV, but I have no codes whatsoever.
Indy is using liqui-moly 5w40 and a quart of Lucas, and says just to drive it till it gets much worse.

I think it may be time to get out before cats fail, and things get worse or more expensive.



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[exorcet]

I'm also seeing a LOT of oil consumption. About 2.5 quarts every 5000 miles.

2016 A6 stock 3.0T.
CREC so no carbon issues to speak of as far as I can tell.
I'm at 102k, so maybe it's time for PCV, but I have no codes whatsoever.
Indy is using liqui-moly 5w40 and a quart of Lucas, and says just to drive it till it gets much worse.

I think it may be time to get out before cats fail, and things get worse or more expensive.



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FWIW I too was using liqui-moly 5w40 and burning about the same. Last oil change ~5k ago I used Castrol Euro 5w40 and consumption has been cut in half. Might be worth switching things up to see if it makes any difference.


Had PCV replaced around 75k and at 90k soft codes came back on P502E. Sounds strangely common -- I replaced 'all the hoses and valves you should replace when you're in there' too.

[TheBlackMarvel]

Check out this post

DIY Updated PCV and ECU Software Follow-up
Just a quick follow-up for those who have done or are going to do the PCV replacement themselves: Even if you don't immediately get a code for the PCV system with the older software loaded, you will at some point. Mine took four months before it started showing up, however it was a soft MIL, no CEL at any point. It has been functioning correctly with zero oil consumption, even when driven hard. The ECU however needs to have its parameters for the updated PVC operating specs updated so it doesn't think it's failing.



You can either get the software updated by an Audi dealer, a VAS-owning independent shop, or from your tuner. If you are already tuned, you are golden.



I went the IE tune route and that resolved my PCV soft code.
https://www.audizine.com/forum/showpost.php?p=14817747



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[exorcet]

I have IE tune and still get the soft code. e85 file last loaded approx Oct '23, 91 file last loaded approx Sep '23... so unless they've added it afterward (which I don't believe as your thread pointing this out is from 2022) I'm pretty certain it's not a slam dunk solution.

edit: just emailed IE to see if it's something they have to manually apply, since I guess they can't assume everyone with CREC has a revised PCV.. will update once I hear

edit2: This is why I like IE. Excellent customer service - answer in about an hour. They said:

"Thank you for your inquiry. We get VW and Audi's most recent ECU updates and incorporate them with our tunes. This is an update that should be on there when you flash one of our tunes to your vehicle."

So if my tune has the new PCV update, it's not doing anything for my P0502E soft code, unfortunately. Everything runs fine no CEL so just more of a very minor annoyance.

[cbezerra]

Did you guys ever find out how to get rid of the soft code?

[MzA6]

I have a 2018 Audi A6 with 106k got the car with 101k oil was just changed when I got it. Burned a 1/2 quart so far. It throws the P052E00 code intermittently. Water pump and thermostat were replaced at 80k not sure If I should waste money and change the Pcv valve and breather hose or just wait till it has a check engine light. Car runs fine no hissing from the engine there is suction when I take off the oil cap.

[GMigic88]

Been a while and appears you are with Jackal instead of IE now. I’m dealing with the issue too and it’s driving me crazy. Already have had blower off 3 times.

I have IE tune and still get the soft code. e85 file last loaded approx Oct '23, 91 file last loaded approx Sep '23... so unless they've added it afterward (which I don't believe as your thread pointing this out is from 2022) I'm pretty certain it's not a slam dunk solution.

edit: just emailed IE to see if it's something they have to manually apply, since I guess they can't assume everyone with CREC has a revised PCV.. will update once I hear

edit2: This is why I like IE. Excellent customer service - answer in about an hour. They said:

"Thank you for your inquiry. We get VW and Audi's most recent ECU updates and incorporate them with our tunes. This is an update that should be on there when you flash one of our tunes to your vehicle."

So if my tune has the new PCV update, it's not doing anything for my P0502E soft code, unfortunately. Everything runs fine no CEL so just more of a very minor annoyance.

- - - Updated - - -

I haven’t how about you?

- - - Updated - - -

Any luck?

[STXA7]

I too had PCV failure about 2 years back ( reservoir would be low on coolant 2 days in a row) without any puddles.
Have had a code in my 034 diag report after flashing to stage 1 file no issues.
Will try out 06E103207AP / report back when i eventually get it in.

[unknid]

has anyone just tried using liqui moly and see if you still have oil consumption ? this is the fix for diesels when they do it without anything being broken.