NOx Sensor Circuit Range/Performance Bank 1 Sensor 1

Where it lives

For P2201, start at the sensor the description names. The description of P2201 puts it on bank 1.

Check these first

• A bank 1 sensor 1 NOx sensor reading outside its expected range
• A contaminated bank 1 sensor 1 NOx sensing element
• An exhaust leak skewing the bank 1 sensor 1 NOx reading
• High resistance in the bank 1 sensor 1 NOx circuit

What to do next

1. Read bank 1 sensor 1 NOx sensor data on a scan tool
2. Compare the bank 1 sensor 1 NOx reading to expected values
3. Check the bank 1 exhaust for leaks
4. Test the bank 1 sensor 1 NOx circuit for added resistance
5. Replace the bank 1 sensor 1 NOx sensor if the circuit tests good
6. Clear the code and retest

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