Before going to the stealer try 0000. thats what my code was, I was installing a subwoofer to the positive terminal and maybe that triggered the car to go into an antitheft mode? My pixels on the radio are all messed up so i just played around with and it ended up being 0000 and she started right up. worth a shot before stealer prices.

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2004 E53 X5 4.4i