Action in service
- Visual inspection of lines and connectors (water or corrosion in connector?)
- Unplug connector and FIRMLY reconnect several times
- Measure lines
- Check catalytic converter (FSD fault 'lean on other cylinder bank' may be entered)
- Are piston rings, fuel injectors, crankshaft ventilation, fuel tank vent valve OK? FSD fault? Then continue there.
- Replace sensor lines or connectors if necessary
- Replace sensor