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Originally Posted by SteveG
UK,
They didn't invalidate the warranty on the Audi TT that my mate currently has. His cylinder head gasket blew after two and a half years and 55,000 miles.
Audi did the full diagnostic check and did not pick up that the ECU had been re-programmed. The work was done free of charge under warranty. If Audi cannot spot the engine has been chipped why will BMW be any better ?
I guess the big question is if BMW do an update of the software, will that overwrite the chipped program and put it back to stock performance levels ?
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Your friend was lucky! I've heard of cases where warranties have been invalidated. Seems a big risk to me. Besides, the performance of BMW diesels is superb and (in my opinion) better than much bigger petrol engines - so who needs the chip??