NOx Sensor Heater Control Circuit High Bank 1 Sensor 2

Where it lives

For P22A5, the circuit described runs through the sensor. The description of P22A5 puts it on bank 1.

Check these first

• The bank 1 NOx sensor 2 heater wire shorted to voltage
• High resistance in the bank 1 sensor 2 heater circuit
• A failing heater element inside bank 1 NOx sensor 2
• Corrosion at the bank 1 sensor 2 connector
• Low battery voltage upsetting the heater current check

What to do next

1. Test the bank 1 sensor 2 heater wire for a short to voltage
2. Measure heater resistance at bank 1 NOx sensor 2
3. Inspect the bank 1 sensor 2 connector for corrosion
4. Check battery and charging voltage
5. Replace bank 1 NOx sensor 2 if the heater resistance is out of range
6. Clear the code and retest

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