Does an ECU need to be reprogrammed if putting a new one in your car?
I have a 2000 Audi A4 that may need an ECU. Called around to some junk yards and found the one I need "3BO 907 551 G". They said they had one out of a Passat that matched that part number. He said it may need to be reprogrammed. What all is involved in switching out the ECU? What would I need to do? If I used an ECU from an Audi would it have to be reprogrammed? Anyone have a spare used ECU that will work for me (as an alternative to the salvage yard one)?
Thanks! (BTW, runs runs real quiet now with new fuel pump, just still runs poorly).
Do I have to VAG it if I get one from an Audi? Or do you have to VAG any of them, regardless ...
of car it came from? And will it run if I just put in it? Reason I ask that last question is that I would have to take it to shop to have them VAG it and I can't see paying them 1/2 labor to just install ECU.
If you get it from Audi they'll charge you an arm and a leg, but they'd probably put it in and make
sure it works. If you get it from an identical car to yours, you won't have to do anything except maybe clear any codes the used ECU might have. For everything else a VAG tool is a must. A tuner shop should be able to install it and recode it for you. You have to ask them for pricing. Or use the vag locator and find somebody willing to help in your area..