Lost all keys and took car to garage to try to get new keys made. In the process, the garage fried the chip on my immobilizer controller/relay (part no# 168 820 04 26).Theyreplaced this partbut the car still will not start...I'm told that it needs to be reprogrammed and that in the process I will need some sort of pin code...can anyone help?

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This is a dealer only repair. Your local garage cannot clone Benz keys.