DTC P0171, P0172 - Oxygen Sensor Related: Notes
CODE DEFINITION - DTC P0171, P0172
| CODE | DESCRIPTION |
|---|---|
| DTC P0171 | SYSTEM TOO LEAN (FUEL TRIM) |
| DTC P0172 | SYSTEM TOO RICH (FUEL TRIM) |
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.