NOx Sensor Circuit Low Bank 1 Sensor 2

Where it lives

For P22A0, the sensor sits on the circuit this code reports. The description of P22A0 puts it on bank 1.

Check these first

• The bank 1 NOx sensor 2 signal wire shorted to ground
• A failed sensor pulling the bank 1 sensor 2 signal low
• Corrosion at the bank 1 sensor 2 connector
• Low battery voltage dropping the sensor output
• An ECM fault on the bank 1 sensor 2 circuit

What to do next

1. Test the bank 1 sensor 2 signal wire for a short to ground
2. Check battery and charging voltage
3. Inspect the bank 1 sensor 2 connector for corrosion
4. Watch bank 1 NOx sensor 2 live data
5. Replace bank 1 NOx sensor 2 if the signal stays low
6. Clear the code and retest

Look up another code