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arturo 5/12/2010
2004 BMW 545i Base 8 Cyl 4.4L - Engine
bmw 545i obd codes p0491 & p0492
1 Answer
  • Bob R.
    Bob R. 5/12/2010
    This is usually the Air pump or air pump valves - Since your car is a V-8, you may have two valves, I'm not sure. would probably know.
    P0491 Secondary Air Injection System (Bank 1)
    P0492 Secondary Air Injection System (Bank 2)

    See my answers to your question on replacing the air pump

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