'10Q7TDI_Prestige'

Dealerships, and especially Audi dealerships/'stealerships' are not known for their mad troubleshooting skills...Audi tends to say "it needs this part replaced" with great confidence, and then they replace it and see if the recommended part swap actually fixed/had any impact on the underlying problem or not. Things like this can be nonexistent or intermittent until they aren't, and often it is related to a bad sensor or an obscure fuse location (located beneath the plenum...not the 'normal' fuse box) that has gone bad. It's possible the prior owner experienced the same issue and either couldn't figure it out or simply decided that was the exit queue, and moved on/traded it while the car was still operable.

It's not that it can't be fixed, but it requires actual troubleshooting/research on the specific underlying symptoms...the flashy dash lights can often distract from the real underlying issue, etc. I'd say if swapping the ECU 'fixes' the issue, then that's a win for you. Be sure to familiarize yourself with the 4L Q7's quirks and 'known service/repair expectations', or you may be in for a bit of a shock...great cars so long as you know what you are buying into. An extended, aftermarket warranty can be a great value if you don't DIY.

Study on the 'known issues' here:
https://differentcarreview.com/2019/...-4l-2005-2015/

Martinoslav

I had the same issue and replacing the ABS cable on my front left wheel solved the problem. Bought frrm ebay for 30 bucks. New is priced for about 250.