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SeanPlunk · 09-30-2009, 10:19 PM

P0170 - Fuel Trim; Bank 1: Malfunction - System Too Lean

boy when it rains it pour engine running lean. I had that same code pop up 2 weeks ago and bought a new front 02 censor my mechanics at a performance shop says you only need to replace the front sensor because that is the one that actually adjusts the fuel trim. In my case it turned out that I had a hole in one of my vacuum lines and that was what was causing my problem of running lean. so my advise check the lines of the vacuum system and then if you do order a sensor only order the bosch for the front only, save you a bit of money.

09-30-2009, 10:19 PM	#3
SeanPlunk Resident Avatar Gambler Join Date: Nov 2006 Posts: 5,997 Tweet	P0170 - Fuel Trim; Bank 1: Malfunction - System Too Lean boy when it rains it pour engine running lean. I had that same code pop up 2 weeks ago and bought a new front 02 censor my mechanics at a performance shop says you only need to replace the front sensor because that is the one that actually adjusts the fuel trim. In my case it turned out that I had a hole in one of my vacuum lines and that was what was causing my problem of running lean. so my advise check the lines of the vacuum system and then if you do order a sensor only order the bosch for the front only, save you a bit of money. __________________ Insanity: doing the same thing over and over again and expecting different results.