BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i) - View Single Post - Bank 1 Rich (Service Engine Soon Code 172)

Florida · 06-28-2012, 02:54 PM

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!

06-28-2012, 02:54 PM	#1
Florida New Member 4 Rep 5 Posts Drives: 135i Join Date: Jun 2012 Location: Orlando iTrader: (0)	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!
	Appreciate 0 Tweet Quote