NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 3

Where it lives

For P23BA, the circuit described runs through the sensor. The description of P23BA puts it on bank 1.

Check these first

• An intermittent open or short in the bank 1 sensor 3 heater sense circuit
• Corrosion or water in the bank 1 sensor 3 heater sense connector
• A failing bank 1 sensor 3 NOx sensor heater
• A loose bank 1 sensor 3 heater sense connector

What to do next

1. Read bank 1 sensor 3 heater sense data on a scan tool while wiggling the harness
2. Inspect the bank 1 sensor 3 heater sense connector for corrosion or water
3. Test the bank 1 sensor 3 heater sense circuit for an intermittent fault
4. Measure bank 1 sensor 3 heater resistance
5. Replace the bank 1 sensor 3 NOx sensor if the sense circuit tests good
6. Clear the code and retest

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