O2 sensor Codes
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AudiWorld Junior Member
Joined: Sep 2021
Posts: 6
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From: Missoula MT
O2 sensor Codes
Hello,
new to the forum and have recently purchased a 99' Audi A6 Quattro Avant with the 2.8L, and have a few questions with some issues it is having.
received the car with 5 CEL codes
P0411 SAI Pump low air flow
P1522 CMP Malfunction B2
P0134 O2 sensor malfunction B1 S1
P0154 02 sensor Malfunction B2 S1
P0432 Cat Converter Bank 2 low performance.
Driveability issues:
semi rough idle when fully warmed up.
after initial inspection of the car the PCV hoses were falling apart (replaced)
grabbed a new PCV valve as well for good measure (havent been able to install it yet)
then cleared the codes.
so far since clearing the codes only 2 came back, P0154, and P0134
before tearing in and replacing the sensors, wanted to get some thoughts on if something else could be causing both S1's to fail like that? i have no idea how long the O2 codes have been there but i personally havent seen them fail in tandem which leaves me to think it there is a possibility might be something else.
possibly SAI and it just hasn't kicked up a code for it yet? driven about 15 miles and start/stops since i erased the codes so i would have thought it would be back if that was the case.
CMP code P1522 hadn't come back yet either.
still has a sort of rough(er) idle when fully warmed up, between idling down after initial cold start, and some time after, it idles great, then eventually gets slightly rougher (unless that is normal?)
thanks
new to the forum and have recently purchased a 99' Audi A6 Quattro Avant with the 2.8L, and have a few questions with some issues it is having.
received the car with 5 CEL codes
P0411 SAI Pump low air flow
P1522 CMP Malfunction B2
P0134 O2 sensor malfunction B1 S1
P0154 02 sensor Malfunction B2 S1
P0432 Cat Converter Bank 2 low performance.
Driveability issues:
semi rough idle when fully warmed up.
after initial inspection of the car the PCV hoses were falling apart (replaced)
grabbed a new PCV valve as well for good measure (havent been able to install it yet)
then cleared the codes.
so far since clearing the codes only 2 came back, P0154, and P0134
before tearing in and replacing the sensors, wanted to get some thoughts on if something else could be causing both S1's to fail like that? i have no idea how long the O2 codes have been there but i personally havent seen them fail in tandem which leaves me to think it there is a possibility might be something else.
possibly SAI and it just hasn't kicked up a code for it yet? driven about 15 miles and start/stops since i erased the codes so i would have thought it would be back if that was the case.
CMP code P1522 hadn't come back yet either.
still has a sort of rough(er) idle when fully warmed up, between idling down after initial cold start, and some time after, it idles great, then eventually gets slightly rougher (unless that is normal?)
thanks
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From: In the Cloud
Thread Starter
AudiWorld Junior Member
Joined: Sep 2021
Posts: 6
Likes: 0
From: Missoula MT
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