DTC P0171: System Too Lean, Or DTC P0172: System Too Rich: Notes

WARNING: Read service precautions before proceeding with service procedure. See SERVICE PRECAUTIONS .

NOTE: These DTCs may be caused by the vehicle running out of fuel.

CAUTION: If Engine Control Module (ECM) replacement is instructed in following test, always ensure ECM electrical connectors and ground circuits are okay. If either are defective, repair and repeat testing to confirm ECM malfunction.