NOx Sensor Heater Sense Circuit Range/Performance Bank 1 Sensor 2

Where it lives

For P22A7, the description names the sensor as the part involved. The description of P22A7 puts it on bank 1.

Check these first

• A heater sense wire with high resistance in the bank 1 sensor 2 circuit
• A failing heater inside bank 1 NOx sensor 2
• Corrosion at the bank 1 sensor 2 sense pins
• A low DEF level affecting sensor performance
• A clogged or restricted SCR system

What to do next

1. Check the DEF level and quality
2. Inspect the bank 1 sensor 2 connector and sense pins
3. Measure the heater sense circuit resistance
4. Check the SCR system for a clog or restriction
5. Replace bank 1 NOx sensor 2 if the sense signal stays out of range
6. Clear the code and retest

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