Yeah, this topic has come up numerous time on the forum.

Owners need to have BOTH remote keys (both operational), and when the door handle fails, fix it ASAP.

Those who choose otherwise run the risk of being locked out.

I recall a member PMing someone with the solution on getting in.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!