CERNY431AA | Genuine Mopar® Particulate Matter Sensor

1. Detects Soot in Exhaust

• Measures tiny particles (PM) generated during combustion

• Detects high soot levels that can clog the Diesel Particulate Filter (DPF)

2. Supports Diesel Particulate Filter (DPF) Regeneration

• Sends signals to the Engine Control Module (ECM)

• ECM adjusts fuel injection or triggers DPF regeneration to burn off accumulated soot

3. Helps Reduce Emissions

• Ensures the vehicle meets emission standards (EPA, Euro 6, etc.)

• Reduces harmful PM released into the atmosphere

4. Provides Diagnostic Feedback

• Alerts the driver or technician if the DPF is clogged or the emission system is failing

1. Check Engine Light (CEL) or Warning Lights

• The most common indicator

• ECM may trigger DPF warning or emissions fault codes (e.g., P242F, P2463)

2. Diesel Particulate Filter (DPF) Issues

• DPF regeneration fails or occurs too frequently

• DPF clogging warnings even if the filter is clean

3. Poor Engine Performance

• Reduced power or engine derate

• Hesitation or rough running if ECM restricts power to protect emissions system

4. Excessive Smoke from Exhaust

• White or black smoke may appear if the ECM miscalculates soot levels

• Incorrect PM readings can lead to improper fuel dosing during regeneration

5. Increased Fuel Consumption

• Failed PM sensor can cause the ECM to trigger more frequent regenerations, using extra fuel

6. Failed Emissions Test

• Vehicle may fail inspection due to inaccurate soot monitoring

• May produce higher-than-allowed particulate emissions

7. Erratic or Intermittent Warning Lights

• DPF or emission lights may turn on/off randomly

• Caused by a sensor sending fluctuating or no signal