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Thank you both for the replies. I swapped out the TMC canbus module and everything suddenly just started working perfectly. I never thought it would be so easy. I wonder why these TMC modules fail so often. I took the broken one apart and couldn't see anything obviously wrong with it... burned comp...

Ok, fair enough. So I should just make sure I get a good one and not dwell on the stories of £6000 turbo replacements and £10k engine failures? I did a lot of research into the RS4 B5 and was hard pressed to find any negative stories about the engine durability etc. Off the back of this I bought on...