Your car already has the keyless entry and security system. By the time you by a new system and install it, you will spend more than it costs for a new "infrared thingy". Go to your local dealer with your key and VIN and get a new one.

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Coast Aero Support Services, LLC
'92 MB 500 SL
'01 BMW 525i Sport
'98 Harley Davidson RoadKing
'74 BMW 3.0 CSi - Gone to a good home