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2007 Chevrolet Cobalt SS P0171 Code: Diagnosis and Fixes for Lean Mix Ratio

Model: 07 chevy cobalt ss Fault Code: P0171 Posted: 2011-04-19 13:25

I own a 2007 Chevrolet Cobalt SS with a supercharged engine. I've been struggling to eliminate the P0171 diagnostic trouble code, which indicates a lean air-fuel mixture in the intake system. This is currently the only code being triggered by the vehicle. I have already replaced the Mass Airflow Sensor (MAS), the fuel filter, and the spark plugs. A professional mechanic has also inspected the vehicle for vacuum leaks and exhaust leaks, with no issues found. The mechanic suggested replacing the fuel injector O-rings as a potential next step. I'm seeking advice from other owners of this model—any insights or additional troubleshooting steps would be greatly appreciated.

Related fault codes
P0171
Comments (2)
Anonymous 2011-04-19 16:56

I plan to install a vacuum hose kit to replace all vacuum hoses, as leaks in the intake system can trigger P0171 on a 2007 Chevrolet Cobalt SS.

Anonymous 2011-04-19 17:13

Could you please share any modifications you've made to your vehicle and whether the P0171 code appeared after one of those changes? This would help determine if the issue is related to performance upgrades or original equipment.