DTC P0170-29: Fuel Trim (Bank 1) - Signal invalid: Action
NOTE:
- Monitor description . Detects when secondary fuelling adaptation offset is too large to maintain emissions within limits
- Operational requirements needed to allow the monitor to be fully tested. Drive vehicle under steady state conditions for up to 20 minutes
- Check exhaust system for leakage. Rectify as required
- Check post catalyst heated oxygen sensor is correctly installed
- Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
- Refer to the appropriate system wiring diagrams and check pre catalyst heated oxygen sensor circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- Refer to the appropriate system wiring diagrams and check post catalyst heated oxygen sensor circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- Clear the DTCs and retest
- Check and install new pre catalyst heated oxygen sensor as required
- Check and install new post catalyst heated oxygen sensor as required