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2004 BMW 745i 745 communication control module 84.21 6 918 520-02 Transmission control module This is a good ecmStock # 3C147 This is a good communication control module for a 2004 BMW 745i. The part # is 84. 21 6 918 520 02. It comes with a 90 day warranty. Make sure your part # matches before ordering. Computer may need to be reprogrammed to your vehicle.