İ have a vw golf 4 1.8t 25th edition tuned from 180hp to 210 hp from the factory by ABT ,since i have the car and readout the faultcodes i have always the fault checksum fault internal module .But the car runs fine...
Can anyone please explain how i can solve this

Thnx

Abt often make circuit board in the ECU,
maybe the fault have to do this

if it doesen"t make from the ori one from the ecu it"s normal that show"s that DTC"s !
i think

I have the same fault.
Car run fine but has DTC.
There was ABT mod , i say was becouse it's not right now and i want to bring it back. If someone of you has that file for 06A906032HN 0001 please let me know :)