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Check Engine - O2 Sensor? Or fuel?

Audi A6 The mid-sized Audi A6 model offers more room to the driver and passengers over the A4 line.

Check Engine - O2 Sensor? Or fuel?

Old 04-12-2017, 06:59 AM
1st Gear
Thread Starter
Join Date: Apr 2017
Location: Nova Scotia
Posts: 7
Default Check Engine - O2 Sensor? Or fuel?

I just purchased a 2000 A6 Quattro 2.8 with the check engine light on.

I was told by the previous owner it was an O2 sensor, but I also found out he was running regular fuel instead of the premium fuel as per the owner's manual.

I just had the codes cleared at the local service centre and I will see if they return.

My question is: could the codes have been caused by running the incorrect type of fuel?

Codes cleared were: PO421 bank 1; PO431 bank 2; P1176; P1423; and P1411.

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