I've had a problem with the 4.2 since the very latest:
Having recently on really meaningful cross-country travel (!)17 L have average consumption (otherwise 12.5-13.5 ), and he only delays the gas and then accelerates up as fast as you can, I thought , let me read out error memory ! Says, done:
1. Lambda probe sporadic error or similar and 2. G40 Hallgeber .
Then I changed the Lambda probe a 2nd time (last one in March Unifit!), but this time an original one of Audi.
Error Lambda can be deleted, V8 runs but still fat 2-3 %!

Error reverberator can not be deleted at all, have then another used reverberator installed and another, then another ECU installed, so that also the same MIST , cable to the ECU measured, also OK.
My experienced "Boschmann" is at the fair and make & soon with his Latin in the end.He has however (still!) not given up.
Has someone had an idea or something like that before? (I couldn't find anything in the search function)
I am looking forward to some answers/ideas/ideas (and my "Boschmann" !

MfG Marko F. (for example, leave on yellow slips with back pain)