Repair procedures (plant/service)
- Visual inspection of wires, DME plug and O2 sensor for damage.
- Inspect wires.
- Check plug-in connections DME <=> Wiring harness <=> Upstream (pre-cat) O2 sensor for Bank 1 (water or corrosion in plug?) => Repeatedly remove the plug and then reconnect it FIRMLY)
- Check catalytic converter (is FSD lean fault entered for the other bank?)
- Piston rings, injectors, positive crankcase ventilation OK? FSD fault? Then continue there!
- Replace O2 sensor
- Replace DME