I had to replace mine as well. Your better off buying a new one. This is a common problem and buying a used one, who knows when that one will crap out. Tischer BMW had the best price-$375.58.

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2005 BMW X5 4.4 Sport Upgrades:

Dinan Cold Air Intake
Dinan Stage II Software
Akebono Euro Cermaic Pads
Brembo Rotors
Titan Silver Metal Gauge Rings
DICE IPOD Module
Hardwired Passport 9500ix Radar/Laser Detector