Component Inspection
- Replace the HO2S.
- Clear DTC with scantool.
- Start the engine and warm it up until the radiator fan comes on (more than at least 10 minutes).
- Drive at a steady speed between 45-55 mph (72-88 km/h) for 30 seconds.
- Stop and then maintain idle state for 30 seconds in D-position.
- Check if O2 sensor monitoring readiness is complete.
- Does the scan tool show DTC P0139?
YES
- Substitute with a known - good PCM and check for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Troubleshooting is finished.