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Sent it to ecu testing and think it was about £250 + vat

Just thought I'd share this link for replacing the window regulator in an A6 C5 as it's the most helpful one I've found. Very clear instructions and tells you which Torx bits and rivets you'll need. The whole process took me about two hours start to finish and I was taking my time to ensure everything was correct. Hope this helps anyone contemplating the same repair. How To: Replacing AUDI C5 RS6 Window Regulator!

Thanks for that.

Check this thread. Do not drive it till it's fixed! As you can do more damage and end up with a more expensive repair.

Hey guys, wanted to share my solution here. My 06 2.0t A3 had an issue where it would crank and crank and crank but no start. Eventually I got it to stumble start and it was then running down on at least 1 cylinder. After giving it some gas it would finally clean up and then run fine. I did not immediately have a CEL, but when checking with an OBD2 reader I got these 5 codes, P0688 - ECM/PCM Power Relay Sense Circuit/Open P2149 - Fuel Injector Group B Supply Voltage Circuit/Open P0300 - Random/Multiple Cylinder Misfire Detected P0303 - Cylinder 3 Misfire Detected P0302 - Cylinder 2 Misfire Detected After some research here and online, no clear answers were given. I saw a lot of people replacing a lot of parts and spending money by blindly throwing parts at the car. When reading over the codes, I felt like most of them were "symptom" codes. The misfires are probably related to injector issues and the injectors not getting power is probably related to the PCM code. So I decided to replace my PCM relay, which in my car was not listed online or in the manual hardly anywhere. Here is a photo of the fusebox. The PCM relay is slot R1, circled in red. After replacing the PCM relay, my car is running properly without issue. Hope this helps someone :)

Thanks to all for the advice, all issues now resolved by replacing the right front level sensor!

Just a update it’s finally running like a dream again ended up being the ecu not sure why garage’s can’t fix problems these days but if your car has this problem before spending thousands replacing all the parts get the ecu checked out.

I had this problem before the problem I'm having now. It stopped. My mechanic changed the glow plugs been fine since.