po171 code

Question

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?

Answer 1

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.