Not as "plug & play" as you might think.

The rear bumper has to be removed to install the OE harness, and that's IF you can find a harness and module.

ECS has the Siemens module (no harness) $230.

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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!