Code 23 (Oxygen Sensor Heating)

OXYGEN SENSOR HEATING
Explanation
This trouble code is stored in the case of a break or short at:

- Oxygen sensor (heater pan)

- Sensor heating relay

- Wire from Digital Motor Electronic (DME) control unit pin 23 to sensor heating relay

- Wires to oxygen sensor

- Output stage in the DME control unit

Troubleshooting
- Perform component activation with tester. The relay is activated at 1 second intervals - this is audible. In the case of defect "connection to sensor signal", check whether the defect is at the sensor or in its supply wire by monitoring the oxygen sensor.
- Proceed with displayed scan tool diagnostic instructions where applicable.