Question

2013 Chevrolet Sonic LT with engine code P0171, what is the meaning?

Answer 1

Hi there,

This code is for a lean fuel mixture. Most common causes would be a leak in the exhaust system, a faulty front O2 sensor, low fuel pressure or mass air flow sensor.

Answer 2

P0171 CHEVROLET - Fuel Trim System Lean Bank 1

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