To ensure reliability, purchase BMW part # 11721433958 Air Pump. It is sometimes referred to as BMW Secondary Air Injection Pump. Genuine parts are first-rate in terms of quality and functionality. Manufactured directly by BMW, they undergo rigorous testing and are made from dependable materials to ensure long-lasting durability and dependability. This part fits 1997-2003 BMW 540i, 2000-2003 BMW M5.
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