Product Overview

The MCT CM1974 is a replacement NOx sensor for heavy-duty exhaust systems, cross-referencing OEM 2871974 and configured for the outlet position. As a direct-fit component, it integrates into existing exhaust layouts to provide accurate downstream nitrogen oxides measurement. The sensor supports the engine control unit (ECU) with real-time feedback, enabling stable aftertreatment control in demanding fleet applications.

Performance and Reliability

Accurate outlet NOx data is critical for verifying SCR catalyst effectiveness and optimizing DEF dosing. The CM1974 delivers consistent readings to help maintain emissions performance while supporting earlier fault detection and diagnostic clarity. Built to meet OEM-grade expectations, the sensor is engineered to withstand high temperatures, vibration, and contamination commonly encountered in diesel exhaust streams. Its direct-fit design helps reduce installation time and return vehicles to service quickly.

Application Guidance

Use OEM part number verification and position (outlet) to confirm fit before ordering. Cross-references include 2894943RX, 0434968, 1869930PRX, 212-075-1021, Automann 577.90546, Dinex 5EL001, and Dorman 577.90546. The CM1974 is part of MCT’s exhaust emissions control line and is stocked for fleet maintenance needs. For best results, replace sensors in accordance with your maintenance schedule and validate system performance via ECU diagnostics after installation.