NH3 Sensor Processor Performance

Where it lives

For P24EE, start at the sensor the description names.

Check these first

• A contaminated NH3 sensing element
• A worn NH3 sensing element inside the sensor
• An NH3 sensor that drifts out of calibration
• A loose or corroded NH3 sensor connector

What to do next

1. Read the NH3 sensor signal on a scan tool
2. Compare the NH3 reading to a known exhaust condition
3. Inspect the NH3 sensing element for contamination
4. Check the NH3 sensor connector for loose or corroded pins
5. Replace the NH3 sensor if the signal drifts or reads wrong
6. Clear the code and retest

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