NOx Sensor Delayed Response - High to Low Bank 1 Sensor 1

Where it lives

For P24F4, the part to look at first is the sensor named here. The description of P24F4 puts it on bank 1.

Check these first

• An aged NOx sensor on bank 1 sensor 1
• A contaminated NOx sensor element
• An exhaust leak ahead of the NOx sensor
• A restricted bank 1 exhaust that slows the sensor response

What to do next

1. Read NOx sensor bank 1 sensor 1 on a scan tool
2. Watch how fast the sensor moves from high to low during a snap throttle
3. Check the bank 1 exhaust for a leak ahead of the sensor
4. Inspect the NOx sensor element for contamination
5. Replace the NOx sensor if the response stays slow
6. Clear the code and retest

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