Running to lean code P0171

SAMGREW

MEMBER
2009 CHEVROLET AVEO
1.6L
4 CYL
FWD
AUTOMATIC
112,000 MILES

Keep getting code saying running to lean, had code saying o2 sensor bank 1. Replaced sensor. Now car hesitates on take-off and during acceleration. Kind of surging during acceleration. Checked for vacuum leaks, found none. Checked intake hose between MAF & Throttle body, everything tight. Cleaned MAF. Still getting P0171. All codes cleared but, car still surging during acceleration

1 Reply

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Hello,

When the engine misfires it will produce a lean code due to the air that is released into the exhaust. I would start with new spark plugs to help that problem. Here is a could of guides that will help you.

https://www.2carpros.com/articles/how-to-change-spark-plugs

and

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Please let us know what happens.

Cheers, Ken