SES code PO 456 What is this - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-24-2008, 05:24 PM
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SES code PO 456 What is this

I've got a 330i, 2005 model and autozone scanned this code for me. The guy said "it's nothing serious". Vacuum pressure leak?

I recently changed the air filter myself. Could this be where the leak is coming from? Any other ideas?
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#2 (permalink) Old 09-25-2008, 06:22 AM
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This thread should give you a few pointers, it can be many things, its a matter of elimination:

E46 engine whistle - vacuum leak? - bimmerfest - BMW Forums

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