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2004 BMW 325i OBD II codes messages

Tiny
HDETRESCOLON
  • MEMBER
  • 2004 BMW 325I
  • 110,000 MILES
My car is having engine misfire problem when start. The mechanic put te OBD II equipment detector and showed following codes ( PO131, PO303, PO174, PO301, PO302, PO300, and PO313). He check all the coils and were good, replace all the sparkplugs and the oxygen sensor and motor running improves a lot. But still showing the code PO131. What it could be?
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Wednesday, June 19th, 2013 AT 6:37 AM

1 Reply

Tiny
DOCHAGERTY
  • MECHANIC
  • 9,601 POSTS
At 110k miles, BMW wants the pre cat O2 sensors replaced. The thing I would do is to swap the sensors and see if the issue moves to the other bank. If so then replacement is warranted
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Wednesday, June 19th, 2013 AT 1:48 PM

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