NOx Sensor Heater Sense Circuit Low Bank 1 Sensor 2

Where it lives

For P22A8, the sensor sits on the circuit this code reports. The description of P22A8 puts it on bank 1.

Check these first

• A NOx heater sense wire shorted to ground
• An open NOx heater element
• A failed bank 1 sensor 2 NOx sensor
• Low battery voltage

What to do next

1. Read NOx heater sense voltage on a scan tool
2. Test the heater sense wire for a short to ground
3. Measure NOx heater element resistance
4. Check battery voltage and the charging system
5. Replace the bank 1 sensor 2 NOx sensor if the heater is open
6. Clear the code and retest

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