NOx Sensor Performance - Sensing Element Bank 1 Sensor 2

Where it lives

For P22FE, start at the sensor the description names. The description of P22FE puts it on bank 1.

Check these first

• A bank 1 sensor 2 sensing element fouled by soot or oil ash
• A sensing element that has aged out of range
• Coolant or water reaching the bank 1 sensor 2 element
• An exhaust leak at the bank 1 sensor 2 boss skewing the reading
• A failing sensor heater that keeps the element from reading correctly

What to do next

1. Read bank 1 NOx sensor 2 live data at operating temperature
2. Check for exhaust leaks and coolant loss around the sensor boss
3. Inspect the bank 1 sensor 2 element and threads for soot or damage
4. Check the DEF level and quality
5. Replace bank 1 NOx sensor 2 if the element stays out of range
6. Clear the code and retest

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