To set the stage - I have a FI fullback exhaust and it's been running perfectly for about 2 yrs now. Last month while I was at a stop light, the engine starts sputtering during and my CEL came right up.
The fault codes I pulled are:
16684 - random/multiple misfire
16815 - warmup catalyst below threshold
16691 - cylinder 7 misfire
Since then I have cleared the code and luckily, the only one that came back is the 16815 code.
I spoke to Audi technicians about this and they said the misfire can happen because lack of back pressure from the fullback exhaust unless I have a bad coil which I don't think it's the case here.
Hopefully you guys can help me out with the last CEL code....I've seen similar code in B5s but nothing yet in the B6/B7 section.
So far, I've tried repositioning and even switching O2 sensors but nothing works yet so I thought I toss is out here and see if there are any other tricks other than getting a new cat. Help an Audi brother out!
Here's the log for your ref:
16815 - Warm Up Catalyst; Bank 2: Efficiency Below Threshold
P0431 - 001 - Upper Limit Exceeded - MIL ON
Freeze Frame:
Fault Status: 11100001
Fault Priority: 0
Fault Frequency: 1
Mileage: 68916 km
Time Indication: 0
Freeze Frame:
RPM: 1472 /min
Load: 45.1 %
Speed: 53.0 km/h
Temperature: 98.0°C
Temperature: 50.0°C
Absolute Pres.: 1000.0 mbar
Voltage: 13.843 V
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