A3C03886300 | Genuine Cummins® Nitrogen Oxide (NOx) Sensor For B4.5 / B6.7 / L9 / F3.8 (CM2350, CM2450)

A NOx (Nitrogen Oxide) sensor A3C03886300 is an electronic device used in internal combustion engines (especially diesel engines) to detect and measure the concentration of nitrogen oxides (NO and NO₂) in the exhaust gases.

General Specifications

Confirmed engine applications

Purpose & Function

• Measures NOx Levels – Detects nitrogen oxide gases in the exhaust.

• Monitors Emissions – Tracks exhaust emissions to ensure they meet environmental standards.

• Sends Data to the ECM – Transmits readings to the engine control module for processing.

• Controls the SCR System – Helps regulate DEF injection to reduce NOx emissions.

• Maintains Engine Efficiency – Supports proper aftertreatment operation and emission control.

Signs of a Bad NOx Sensor

• Check Engine Light – NOx sensor-related warning appears.

• Fault Codes – Diagnostic trouble codes related to NOx readings or sensor circuits.

• Increased DEF Consumption – Incorrect readings may cause improper DEF dosing.

• Failed Emissions Test – Exhaust NOx levels may exceed permitted limits.

• Reduced Engine Power – Engine may enter derate mode.

• SCR System Malfunction – Aftertreatment system may operate incorrectly.

• Poor Fuel Efficiency – Engine performance and efficiency may decrease.

About the Manufacturer – Cummins:

Cummins is a leading American manufacturer of diesel and natural gas engines, as well as power generation systems and emissions solutions. Founded in 1919 and headquartered in Columbus, Indiana, Cummins is known globally for its durable, high-performance engines used in trucks, buses, construction equipment, agriculture, and power systems.

The brand is widely respected for its innovation in clean diesel technology, including aftertreatment systems, turbochargers, and advanced electronics that help reduce emissions while maximizing engine efficiency and reliability.