We Repair a lot Mercedes Truck ECU'S and code quite a number of keys and we have the support of some of the best certified Mercedes Truck Technicians. We find some truck owners generally get the wrong Mechanics to work on their vehicles. This particular truck key was sent in for repair we had a look at the key and the key looked fairly decent but it broke by the head. We extracted the old key from the ignition cut the new key swapped chips and cloned a second key as a spare. The keys were return