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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 09-24-2008, 04:24 PM   #1 (permalink)
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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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Old 09-25-2008, 05:22 AM   #2 (permalink)
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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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