DTC P0171, DTC P0172, DTC P0174 Or DTC P0175: Notes

Code Definition

DTC P0171: System Too Lean (Bank No. 1)
DTC P0172: System Too Rich (Bank No. 1)
DTC P0174: System Too Lean (Bank No. 2)
DTC P0175: System Too Rich (Bank No. 2)

CAUTION: If ECM replacement is instructed in following testing, always ensure ECM harness connector and ground circuit are okay. If either are suspect, repair and repeat testing to confirm ECM malfunction. If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES - IMPORT article in GENERAL INFORMATION.