Hi folks, I've got a 2004 B6 S4 Avant with what I think might be a mad ECU, and now it won't start - not even turn over.
It started with the key fob not working the central locking so I had to use the key to start the car. Also occasionally I'd come out to find the hazards flashing but no alarm noise. I took the car to an Audi dealer and bought myself a new key and got the old one recoded and everything seemed fine, although occasionally it would still do the flashing hazards thing.
Last week, both keys stopped working the central locking which tells me it can't be the keys - one of them is brand new. It would still start on the key though. Now I try to start the car, I get some lights on the dash, the fuel gauge flickers a bit and I can hear a whiring clicking noise (fuel pump maybe?) and then nothing when I turn the ignition.
I've tried disconnecting the battery and reconnecting. I've tried charging the battery (although it is a new one so I don't think it's that).
Any ideas folks. ECU fault maybe?? I'm just uploading a video to YouTube so on the off chance it helps I'll post a link once it's up.