Your bmw has an electronically coded chip integrated into the car key the code is twofold one is a permanent code personalised to the car and the second is rolling code changed by the immobiliser each time the car is started when the ignition is switched on the cars immobiliser first reads the personal code then asks the key for the rolling . Reprogramming your vehicle or a used key fob to allow the two to be paired would require overriding key parts of your bmws anti theft system potentially compromising its security like bmw we recommend only attempting to use key fobs ordered from a bmw dealership or a reputable third party reseller such as bimmertech. This is the last part of a bmw key programming cas2 installed under dash we tested the key dash lights came on all gages work and odometer dispayed mileagesince car was wrecked airbags . Invalid zip code zip code search financial services apply for financing bmw key replacement if you need assistance with a replacement key please contact your bmw center directly locate a dealer california residents needing assistance with a replacement key please call 1 888 575 5397 at any time
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