NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 1

Where it lives

For P2212, the sensor sits on the circuit this code reports. The description of P2212 puts it on bank 1.

Check these first

• A loose bank 1 sensor 1 NOx heater sense connector
• An intermittent open in the bank 1 sensor 1 NOx heater sense harness
• Vibration shaking the bank 1 sensor 1 NOx heater sense wiring
• A failing bank 1 sensor 1 NOx heater element with an unstable sense

What to do next

1. Read bank 1 sensor 1 NOx heater sense voltage while wiggling the harness
2. Inspect the bank 1 sensor 1 NOx heater sense connector for loose pins
3. Check the bank 1 sensor 1 NOx heater sense harness for intermittent opens
4. Review freeze frame data for the conditions at fault
5. Replace the bank 1 sensor 1 NOx sensor if the harness tests good
6. Clear the code and retest

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