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#1
05-24-2004, 06:55 PM
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Secondary Air System Flow
My check engine light came on and I ran the codes. I have a 328i convertible with 63k miles. The chart states: "Secondary Air System Flow Too Low." Please explain what the seconday air system is, and what I can do to fix the problem. I will avoid the dealership at all costs, they are terribly expensive. Thanks for any help,
Philip Schmalz 
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#2
05-25-2004, 08:48 PM
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Re: Secondary Air System Flow
the secondary air system injects fresh air from the big round black pump mounted behind the R/F shock tower. Replace it and the non-return valve on the front exhaust manifold. Make sure to get all the water out of that plastic intake pipe that ends behind the R/F headlamps...the pumps burn out and the valves can leak. have fun.
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