NOx Sensor Calibration Memory Bank 1 Sensor 3

Where it lives

For P23BC, the part to look at first is the sensor named here. The description of P23BC puts it on bank 1.

Check these first

• A calibration memory fault in the bank 1 sensor 3 NOx sensor
• A failed bank 1 sensor 3 NOx sensor
• An interrupted calibration write to the bank 1 sensor 3 NOx sensor
• Low voltage during the bank 1 sensor 3 calibration

What to do next

1. Read bank 1 sensor 3 NOx sensor status and calibration data on a scan tool
2. Check charging voltage and battery condition
3. Run the bank 1 sensor 3 NOx sensor calibration procedure
4. Replace the bank 1 sensor 3 NOx sensor if the calibration will not store
5. Clear the code and retest

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