where is the location of the air injection check valve

2000 BMW 328
178,000 MILES
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EDLING613
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It is a small plastic check valve. I have located all the vacume lines I can find and cannot find the check valve. can anyone help the car is 328ci.OBD codes are P1423 and P1421.
Oct 5, 2012 at 10:08 PM
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HMAC300
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it's eitehr the one on the air pipe to the exaust or it's on the air pump itself.
Oct 6, 2012 at 12:04 AM
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EDLING613
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checked both could the codes mean something else? Already checked air pump control valve, and vacuum lines.
Oct 6, 2012 at 8:19 PM
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HMAC300
  • CAR REPAIR CONTRIBUTOR
  • 48,601 POSTS
if you weren't getting vacuum to operate teh valve then that could be it. we dont 'have any good drawings/placements of that part. all we have is a typical type thing with nothing for your car. BMW and Merecedes like to look you into their dealers so they only give very basic stuff.
Oct 6, 2012 at 9:20 PM