NOx Sensor Circuit Low Bank 1 Sensor 3

Where it lives

For P23AE, the sensor sits on the circuit this code reports. The description of P23AE puts it on bank 1.

Check these first

• A short to ground on the bank 1 sensor 3 NOx sensor signal wire
• An open in the bank 1 sensor 3 NOx sensor ground
• A failed bank 1 sensor 3 NOx sensor
• A low reference at the bank 1 sensor 3 NOx sensor

What to do next

1. Read bank 1 sensor 3 NOx sensor voltage on a scan tool
2. Test the bank 1 sensor 3 signal wire for a short to ground
3. Check the bank 1 sensor 3 NOx sensor ground and reference
4. Inspect the bank 1 sensor 3 connector for corrosion
5. Replace the bank 1 sensor 3 NOx sensor if the circuit tests good
6. Clear the code and retest

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