Well bring a really typical blond I switched the jumper leads onto the wrong terminals on the battery.Red to black and Visa Versa. I blew up the on board computer.
Hence I blew up the ECU. I really love this car.
Now do I replace only the ECU or do I also have to replace the key module inside the car and a silver piece I don’t know what it is called.
Please help I have managed to find exactly the correct ECU’s with the correct Mercedes part no but do I need to replace the other 2 things.
I really would appreciate an URGENT reply from anyone who knows please.