Q Is the checksum fix the same as the immobilizer?
No, the immobilizer is a separate feature in certain dbw cars that involves a transponder in the ignition key and a separate immobilizer module that communicates with the ecu. Basically, the codes transmitted by the owner’s key have to match up with the codes in the module and the codes on the ecu. If they don’t match, the car won’t start. Because the codes are not stored in the rom that you read/flash with Ecuflash, tuning your car with RomRaider will not affect the immobilizer function. The problem occurs when you try to physically install a different ecu in these cars. Currently, only dealers have the ability to update the immobilizer when the ecu or keys are changed.