Determining if your ECU / DME has failed and what faults are present is the initial step in changing or fixing your destroyed . The most simple exams to ascertain In case your ECU / DME has failed are: OBD fault codes - Most diagnostic scanners can read fault codes https://bmw-ecu-validation-servic76419.wizzardsblog.com/29953090/ecu-audi-a4-secrets