DTC P2237-85: O2 Sensor Positive Current Control Circuit/Open - Bank 1, Sensor 1 - Signal above allowable range: Action
- Refer to the appropriate system wiring diagrams and check heated oxygen sensor circuit for short circuit to ground, short circuit to power, open circuit, high resistance
- Inspect connectors for signs of water ingress, and pins for damage and/or corrosion
- Clear the DTCs and retest
- Check and install new heated oxygen sensor as required