1997 BMW 328i Air Pump
Pierburg Air Pump
Part Number: W0133-1599050
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Works. This is the OEM part. It works fine. I would not recommend buying this part without buying, or at least checking your "air pump control valve," which is bolted to your exhaust manifold. Failure of the control valve is very often the reason that the air pump goes bad...when the valve fails exhaust gasses blow into the pump and do bad, bad things to it.