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po171 code

I have a 06 chevy trailblazer, my engine light is on,but not the service engine light, I have 2 different lights.My trailblazer runs great but i cant keep the light from coming on.I 've unhooked the neg battary post to reset the computer,but usually the next day it comes back on.I cant figure out what could be causing it?

Vehicle: 06 chevy trailblazer, 4.2 v 6
asked Aug 29, 2012 by anonymous

1 Answer

P0171 CHEVROLET - Fuel Trim System Lean Bank 1

Read more: https://www.autocodes.com/p0171_chevrolet.html

There are many things that can trigger that code. We suggest starting by checking for intake leaks, dirty air filter and mass air flow (MAF) sensor.

answered Aug 29, 2012 by OBDIITech (2,745 points)
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