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      06-28-2012, 02:54 PM   #1
Florida
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Drives: 135i
Join Date: Jun 2012
Location: Orlando

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Bank 1 Rich (Service Engine Soon Code 172)

Hi. I just got a service engine soon light so I checked the code and it came back as code 172 which is bank 1 rich. I was going to give it a try to fix it since I enjoy working on cars before I take it in. I don't think it is a bad 02 sensor since the car has less than 50k miles. It's running rich so I think it might be a leak in a vacuum line. What else could it be? The car is a 2009 135i. Thanks for any help in advanced!