tt225roadster

I have a chipped and a stock ecu
Is there recoding involved everytime you swap?
Is there a record of the 2 ecus being used.
How has it worked out for you?

JustJeff

If you swap a chipped ECU for stock ECU for example, and then take it to the dealer, this is a way they can tell at the least, the ECU was swapped, or the battery cable was removed.
They then may challenge you on this and ask you, "Are you chipped?"
If you replace the chipped ECU for the stock one, and do not clear this code before going to the dealer, they will pull the DTC that sez "Terminal Voltage Too Low"
Other than that, there is no other way to tell if you ran a chipped or modified ECU.

tt225roadster

Will I have to code the new ecu to the car ?

JustJeff

Not sure I know what you mean? ECU is car-specific

tt225roadster

ECU1 that came with car is chipped.
ECU2 I bought new is in the car now and running
Both ecu's are the same type.
If I put ECU1 back in do I have to do anything with the VAG or does it just work.
Is it plug and play right with no other concerns? Just wanted to confirm.

JustJeff

1. Clear the 'terminal voltage' DTC.
2. Do a Throttle Body Adaptation.

EasTTcoasTT

He's talking about the immobilizer.

JustJeff

Oh, ya, duh, that too. I keep forgetting 'bout that with the newer cars