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Mopar  |  SKU: CERNY431AA

CERNY431AA | Genuine Mopar® Particulate Matter Sensor

$8900
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ConditionNew
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365-day / 100,000-mile limited warranty on U.S. orders. Return conditions apply. Mandatory legal rights remain unaffected.

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Description:
A Particulate Matter (PM) Sensor CERNY431AA is a device used in vehicles—especially diesel engines—to measure the concentration of particulate matter (soot) in the exhaust gases. It helps monitor and control emissions to ensure compliance with environmental regulations.

Part Number: CERNY431AA 
Condition: New
Manufacture/Brand: Mopar

Purpose of using CERNY431AA:

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

 

Signs of a Bad Particulate Matter Sensor CERNY431AA:

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


About the Manufacturer – Mopar:

Mopar is the official parts, service, and customer care brand for Chrysler, Dodge, Jeep, Ram, and Fiat vehicles. Originally short for “Motor Parts”, Mopar was established in 1937 and is now a global brand under Stellantis.

Mopar supplies genuine OEM parts, accessories, and performance upgrades, and it supports dealerships and technicians with tools, diagnostics, and factory-backed service. Known especially among enthusiasts for its muscle car heritage, Mopar is also a major presence in motorsports and custom vehicle culture.

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