You should have one. Sits on the drivers side fender well right behind the air box. #15 in this diagram. Some have said these can fail but they usually make noise first.

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• 2004 E53 X5 3.0 ZSP (4/04 build date) Jet Black exterior/Sand Beige interior
• 2002 E46 325i ZPP (2/02 build date) Alpine White exterior/Hell Beige interior

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