NOx Sensor Circuit Bank 1 Sensor 2

Where it lives

For P229E, the circuit described runs through the sensor. The description of P229E puts it on bank 1.

Check these first

• A failed bank 1 NOx sensor 2
• A broken signal wire in the bank 1 sensor 2 circuit
• Corrosion at the bank 1 sensor 2 connector
• A weak ground at bank 1 sensor 2
• An ECM fault on the bank 1 sensor 2 input

What to do next

1. Inspect the bank 1 sensor 2 wiring and connector
2. Watch bank 1 NOx sensor 2 live data through a drive cycle
3. Check the bank 1 sensor 2 ground for voltage drop
4. Test the signal wire for opens and shorts
5. Replace bank 1 NOx sensor 2 if the signal stays out of range
6. Clear the code and retest

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