o2 sensor spacer.

[EuroSwag]

Just purchased a 42DD sensor spacer for my 2010 2.0t hoping it would take the CEL away from having a test pipe. I've tried different configurations of the spacer and still a check engine light will be there as quickly as I erase it. Is there any other sensor spacers that are worth trying? Also heard revo stage 2 would be an option as it changes the sensitivity of the secondary sensor? Any help would be appreciated need to pass inspection and have the readiness monitors set!

[IHave2Turbos]

There are likely different solutions, up to an including disabling the rear 02 and or hard coding it with a predefined "good" value. As for spacers, each car is different, some work with one spacer, some work by doubling them up, some only work with the mini-cat spacers. Takes a bit of testing. That being said, I have a non-catted spacer if you need/want to try another one. PM for details.

[elscotto80]

Are you chipped? Best bet is to have the stock program available and switch to that for emissions. If they visually inspect then you may need to put the stock cat back on. I run APR and have the stage II 93 file and stock. When it's emissions time, I switch to stock get tested and switch back.

Fwiw, I have the 42dd spacer on the 034 hfc and do not have a MIL on either program.

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[AutoRacer100]

Are you chipped? I run APR and have the stage II 93 file and stock. When it's emissions time, I switch to stock get tested and switch back.

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Does it work every single time?

[elscotto80]

Does what work? I have only done emissions once this way being chipped. I tried with stage II app and it failed. Added the stock program, switched to that (no change to hfc or sensor setup) and took it back, passed.

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[Spawne32]

There are likely different solutions, up to an including disabling the rear 02 and or hard coding it with a predefined "good" value. As for spacers, each car is different, some work with one spacer, some work by doubling them up, some only work with the mini-cat spacers. Takes a bit of testing. That being said, I have a non-catted spacer if you need/want to try another one. PM for details.

Who has ever hard coded it to a predefined good value? Thought the most we were able to do is delete the codes but then it doesn't complete the readiness tests. I keep getting P2271 on mine with the 034 HFC and right angle spacer.

[EuroSwag]

There are likely different solutions, up to an including disabling the rear 02 and or hard coding it with a predefined "good" value. As for spacers, each car is different, some work with one spacer, some work by doubling them up, some only work with the mini-cat spacers. Takes a bit of testing. That being said, I have a non-catted spacer if you need/want to try another one. PM for details.

Okay maybe I'll try the catted version spacer since I have a non catted one now. Thanks a lot I'll definitely try some different configurations

[Liquid Smoke]

Roc-Euro spacer with catalyst, it's almost guaranteed to work, best reviews i've seen and best success rate out of all spacers. i've been running mine for like close to 2 years now, code hasn't returned at all. worth it, it's like $35 or so. i think i got the 90 degree one im not sure, but the straight one should work fine too.

https://roc-euro.com/collections/acc.../sensor-spacer

[AutoRacer100]

Roc-Euro spacer with catalyst, it's almost guaranteed to work, best reviews i've seen and best success rate out of all spacers. i've been running mine for like close to 2 years now, code hasn't returned at all. worth it, it's like $35 or so. i think i got the 90 degree one im not sure, but the straight one should work fine too.

https://roc-euro.com/collections/acc.../sensor-spacer

What HFC and dp are you using now with Roc-Euro spacer?

[Liquid Smoke]

What HFC and dp are you using now with Roc-Euro spacer?

i'm actually still on the stock cat, no mods there. the reason for the spacer was because my stock cat was throwing error codes, i was at like 100k miles at the time (125k now), so my oem cat was prob going bad. i originally got the spacer to pass inspection and then eventually replace the cat or get a HFC, but the error never came back after the spacer so i've just left it for now, but still do plan to get a HFC very soon and will keep this same spacer. and before i got the spacer, i cleared and had that error for a few weeks, it was definitely the stock cat throwing the error after multiple cleared codes, so not a coincidence or anything that the spacer happened to be there when the errors stopped.

[bakedziti]

What HFC and dp are you using now with Roc-Euro spacer?

My HFC is from Eurocode, and I have a Roc-Euro 45° catted spacer; works like a charm. Only advice, call them after you place your order or even before; they can be slow to ship, but it was actually on the shelf when I bought mine even though the site said it wasn't.

[AutoRacer100]

My HFC is from Eurocode, and I have a Roc-Euro 45° catted spacer; works like a charm. Only advice, call them after you place your order or even before; they can be slow to ship, but it was actually on the shelf when I bought mine even though the site said it wasn't.

Wow, thanks for the feedback. So should I pull the trigger on APR DP now? It's very attempting after seeing this reply.

[Liquid Smoke]

Wow, thanks for the feedback. So should I pull the trigger on APR DP now? It's very attempting after seeing this reply.

be careful with HFC vs Downpipe. the HFC may work well with the spacer as it's already got a catalyst, but the DP are just wide open i believe and there's less chance of the spacer working on that error-free as it will on an HFC.

[AutoRacer100]

be careful with HFC vs Downpipe. the HFC may work well with the spacer as it's already got a catalyst, but the DP are just wide open i believe and there's less chance of the spacer working on that error-free as it will on an HFC.

The APR dp comes with a HFC.

[bakedziti]

Isn't the APR DP an HFC and the downpipe combined? If so, I recall it being catted, and it should work pretty well with that spacer. Obviously, your results could be different, but its worked very well for me.

[AutoRacer100]

Isn't the APR DP an HFC and the downpipe combined? If so, I recall it being catted, and it should work pretty well with that spacer. Obviously, your results could be different, but its worked very well for me.

You have Roc-Euro 45 degree spacer on APR dp/HFC?

[Liquid Smoke]

sorry disregard that, i was thinking TESTpipe instead of downpipe haha

[bakedziti]

You have Roc-Euro 45 degree spacer on APR dp/HFC?

No, I have a Eurocode HFC followed by a stasis catback, no issues here.

[AutoRacer100]

Does aftermarket dp removes the stock resonator?

@bakedziti, so you have Eurocode HFC and stock dp, then a full catback Stasis. The full catback statsis exhaust starts right after the stock dp? I've always thought catback exhaust starts right after the cat. That's why it is called catback.

[bakedziti]

Does aftermarket dp removes the stock resonator?

@bakedziti, so you have Eurocode HFC and stock dp, then a full catback Stasis. The full catback statsis exhaust starts right after the stock dp? I've always thought catback exhaust starts right after the cat. That's why it is called catback.

The DP answer is all dependent upon who's making it, and what they refer to as a DP. Eurocode's HFC is simply a 200 cell cat, but doesn't include the DP. The stasis catback is exactly what it sounds like, and completes the exhaust after the cat. Audi technically refers to the DP as the piece after the cat. I think you're confused because APR markets theirs as a two piece HFC with a DP. 034; Eurocode; Spulen; etc don't do that.

EDIT: images help

Eurocode HFC:


Stasis exhaust: the pipe all the way in the back of the image is the DP, and mine is resonated.


APR's HFC with a DP that I believe they call the DP:


Audi DP:

[AutoRacer100]

Thanks for clarifying and the pics.

I know Stasis is no longer in the exhaust business. If I have APR dp and a full Stasis exhaust. Then I will have extra dp. APR dp with HFC and full stasis exhaust starts after the cat.

[Walletclan]

Thanks for clarifying and the pics.

I know Stasis is no longer in the exhaust business. If I have APR dp and a full Stasis exhaust. Then I will have extra dp. APR dp with HFC and full stasis exhaust starts after the cat.

Wouldn't that leave you with an extra HFC, if the APR downpipe includes a HFC. If you do have an extra HFC, I'll buy it from you if unused.