Audi S8 D2 misfire Lambda sensor fault

[richyb66]

I'm not convinced that the lamba fault would cause a misfire either.

You say the misfire is noticeable at idle but are there any other symptoms when it's running normally? I had a "misfire" at idle and the car felt a bit down on power - no relevant codes were stored. After swapping a few bits and having a bit of a think, I finally tracked it down to a faulty fuel pump. The old pump was causing a fluctuation in fuel pressure that was causing the car to run poorly and it had seemed more noticeable at idle for some reason.