MERCEDES, VOLVO

BMW began using transponder keys on all models in 1995, with the exception of some 3 Series with followed shortly.

Mercedes uses transponder systems on all 1997 and up models.

Volvo uses transponder immobilization on all cars 1999 and up, except for the large trucks.

  

Currently, all three of these auto makers have exclusive control of replacement keys.

BMW uses a "rolling code" transponder which changes value each time the key is used. There are 10 unique chips programmed into the immobilization system when each car is manufactured. A certain number of keys are provided when the car is purchased, and additional keys must be ordered through a dealer. Once all 10 keys are supplied, there can be no more provided and certain components of the immobilizer system must be replaced.

Mercedes uses a rolling code system, with keys which must be ordered through Mercedes distribution.

Volvo uses a proprietary system which requires the vehicle to be connected to dealership diagnostic equipment for key programming.

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