Anyone else think the discrepancy between my bank 1 and 2 O2 sensors looks fishy?

RLG · 09-12-2005, 04:14 PM

No DTC's except for 16815 / 16805 with Labree DPs (warm up catalyst efficiency below threshold). Cleared and never returned.

Did NOT replace O2 sensors after losing the passenger turbo (and subsequently replacing both turbos) in March.

Any thoughts? Any other ways to *test* O2 sensors? I would like to start doing some tweaking, but if the O2's are bad, I'd obviously want to take care of that first.

Thanks for your expertise....

Some primary O2 voltage data logged the other night...

Mike2kS4 · 09-12-2005, 04:33 PM

I lost a turbo too, and it got oiled like crazy.

I have spares from my other motor. Maybe tomorrow night I'll swap em out.

RLG · 09-12-2005, 04:38 PM

Out of curiosity, are you registering richer or leaner on the side that saw the blown turbo?

Thanks Mike....

Mike2kS4 · 09-12-2005, 04:41 PM

Also my calculated EGT's are off on both sides due to burnage.

The car still goes like stink and throws no codes. If your car is the same, I'd run it until it starts throwing codes. Or if you're anal like me, change it out.

RLG · 09-12-2005, 04:46 PM

X - 1 _ r a c e r · 09-12-2005, 07:30 PM

Not diss'n on Scott's O2s; very fine product. I oiled the heck out of B1 too last year. So I shuffled my injectors around and it changed. Leads me to believe I need to RC my injectors. Oh goody.

Mike2kS4 · 09-12-2005, 07:37 PM

RLG · 09-12-2005, 08:02 PM

I think I'll start with the O2s - if that doesn't fix it, then I'll deal with the injectors. Only problem at that point will be the temptation to go with bigger fueling... wife will murder me...

Regardless, thanks guys for your input. Very nice of you to take the time to try to help me out. Much appreciated.

lemieux@curbside · 09-13-2005, 05:34 AM

my prev. post

09-12-2005, 04:14 PM	#1
RLG AudiWorld Super User Account #: 83796 Join Date: Nov 2004 Posts: 4,207	Anyone else think the discrepancy between my bank 1 and 2 O2 sensors looks fishy? No DTC's except for 16815 / 16805 with Labree DPs (warm up catalyst efficiency below threshold). Cleared and never returned. Did NOT replace O2 sensors after losing the passenger turbo (and subsequently replacing both turbos) in March. Any thoughts? Any other ways to test O2 sensors? I would like to start doing some tweaking, but if the O2's are bad, I'd obviously want to take care of that first. Thanks for your expertise.... Some primary O2 voltage data logged the other night... __________________

09-12-2005, 04:33 PM	#2
Mike2kS4 Elder Member Account #: 38083 Join Date: Jun 2002 Posts: 12,104	Mine are the same way... I was going to swap them out tonight, but I'm feeling too lazy ;) I lost a turbo too, and it got oiled like crazy. I have spares from my other motor. Maybe tomorrow night I'll swap em out. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

09-12-2005, 04:38 PM	#3
RLG AudiWorld Super User Account #: 83796 Join Date: Nov 2004 Posts: 4,207	Word to being lazy ;) Out of curiosity, are you registering richer or leaner on the side that saw the blown turbo? Thanks Mike.... __________________

09-12-2005, 04:41 PM	#4
Mike2kS4 Elder Member Account #: 38083 Join Date: Jun 2002 Posts: 12,104	Leaner. Also my calculated EGT's are off on both sides due to burnage. The car still goes like stink and throws no codes. If your car is the same, I'd run it until it starts throwing codes. Or if you're anal like me, change it out. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

09-12-2005, 04:46 PM	#5
RLG AudiWorld Super User Account #: 83796 Join Date: Nov 2004 Posts: 4,207	Yeah, I think I'll switch them out, too. Thanks man... __________________

09-12-2005, 07:30 PM	#6
X - 1 _ r a c e r Member Account #: 57674 Join Date: Jun 2003 Posts: 2,426	Mine read like that too, so I put in Zoldmans', no change. Not diss'n on Scott's O2s; very fine product. I oiled the heck out of B1 too last year. So I shuffled my injectors around and it changed. Leads me to believe I need to RC my injectors. Oh goody. __________________ _________________________________________ "Welcome to the wonderful world of S4 ownership. No more happiness for you" VandyS4 ----------------------------------------- 3.8 FATS on 91 octane, no more APR hating! ------------------------------------- If someone stole Troy's Penskes he might not notice until 2008... ...when he goes to sell them (NIB) for something else. _________________________________________

09-12-2005, 07:37 PM	#7
Mike2kS4 Elder Member Account #: 38083 Join Date: Jun 2002 Posts: 12,104	FWIW: I had three different sets of injectors and had the same O2 disparity. __________________ 2002 S4 Avant, 6spd. Bone stock. <a href="http://www.autospeed.us"> </a> Caveat: Any advice I express regarding potential tuning and such is purely informational. If your knowledge and abilities are not up to the task, no amount of advice can assist.

09-12-2005, 08:02 PM	#8
RLG AudiWorld Super User Account #: 83796 Join Date: Nov 2004 Posts: 4,207	Figure it's got to be one or the other... I think I'll start with the O2s - if that doesn't fix it, then I'll deal with the injectors. Only problem at that point will be the temptation to go with bigger fueling... wife will murder me... Regardless, thanks guys for your input. Very nice of you to take the time to try to help me out. Much appreciated. __________________

09-13-2005, 05:34 AM	#9
lemieux@curbside AudiWorld Super User Account #: 47312 Join Date: Dec 2002 Posts: 17,783	yep i had something similar.. change them both with the 25$ vw parts my prev. post __________________ ************************************************ ************************************* "it's a B5 S4 ,it may break down, but its far enough ahead, by the time its fixed, you still haven't caught up." -best line i've heard AUDI B5 S4 detail info (pdf file) that everyone should read and have saved on his computer AUDI B5 RS4 study guide detail info (pdf file) FATS database VAG-COM LOCATOR ASP Hands down the "BESTEST" tuner out there.

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