WJIECO 2872946 NOx Sensor Durable Cross references 4326874, 2872946RX, 4326874RX, 5WK96741A, 5WK96741B. 24V downstream outlet NOx Sensor for Cummins ISB6.7, ISX11.9, ISX15 heavy-duty diesel engines. Fits Freightliner, Kenworth, Peterbilt, International, Western Star trucks, plug & play install.

2872946 NOx Sensor Overview

The 2872946 NOx Sensor manufactured by WJIECO is the downstream outlet NOx sensor in the SCR aftertreatment system for heavy-duty trucks powered by Cummins ISB6.7, ISX11.9 and ISX15 diesel engines. Installed after the SCR catalyst, this NOx Sensor samples exhaust gas to detect residual NOx after DEF urea reacts inside the SCR canister.

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The ECM compares readings captured by this downstream NOx Sensor against data from the upstream NOx Sensor to calculate SCR conversion efficiency. If this NOx Sensor suffers signal drift, soot blockage, internal chip failure or CAN communication loss, the ECU will log SCR efficiency fault codes, illuminate the check engine light, activate engine power derate, and prevent the truck from passing state or federal emissions inspections.

Many diesel fleet technicians encounter intermittent trouble codes triggered by thermal fatigue and soot contamination on aging downstream NOx Sensors, which often only surface under long-haul highway operating conditions. This sensor cross-references interchange numbers: 2872946, 4326874, 2872946RX, 4326874RX, 5WK96741A, 5WK96741B for quick part matching for fleet managers, independent diesel repair shops and owner-operator truck drivers across the USA.

H2: OEM-Grade Construction & Strict Factory Testing

Our 2872946 NOx Sensor features a high-stability ceramic sensing chip, heavy-duty heat-resistant stainless steel housing and fully sealed 4-pin oval wiring harness assembly. It is engineered to withstand sustained high exhaust temperatures, constant engine vibration, rapid thermal shock, heavy soot buildup, and exposure to road salt, mud and moisture through all seasons across North America. Low-cost generic heavy-duty NOx Sensors commonly skip long-duration high-temperature aging calibration, leading to signal drift and premature failure after just a few thousand miles of highway operation.

Every finished 2872946 NOx Sensor passes a full series of factory quality checks: precision signal calibration, high-temperature aging test, waterproof seal integrity inspection and connector pin continuity testing before packing. This strict QC workflow ensures consistent NOx measurement, stable ECU CAN communication and extended service life inside the harsh diesel exhaust aftertreatment assembly.

H2: Vehicle Fitment (Amazon US Heavy Duty Truck Fitment List)

Compatible Cummins Engines: Cummins ISB6.7, ISX11.9, ISX15.0 Diesel (2013–2020)

• Freightliner: Cascadia, M2 106, M2 112, Coronado
• Kenworth: T660, T680, T700, T800, T880, W900
• Peterbilt: 384, 386, 389, 567, 579
• International: ProStar, LT, RH, HV
• Western Star: 4700, 4900, 5700XE
• Blue Bird: All American FE Bus (2016–2018)

Important note: This is the 24V DOWNSTREAM OUTLET NOx Sensor with 4-pin oval plug. NOT compatible with 12V Ram 2500/3500 pickup trucks. Verify your VIN, engine type, connector shape, voltage rating and original OEM part number before purchase. Installing the wrong NOx Sensor will create persistent SCR monitoring errors that cannot be cleared easily.

Interchange OE Numbers: 2872946, 4326874, 2872946RX, 4326874RX, 5WK96741A, 5WK96741B

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WJIECO 4326873 NOx Sensor Durable Cross references 5WK96742B, 2872948. OEM-grade upstream NOx Sensor for 2013–2018 Dodge Ram 2500 3500 4500 5500 6.7L Cummins Diesel. SCR system control, plug & play install.

H2: Core Benefits of 2872946 NOx Sensor

Replacing your defective downstream NOx Sensor with the WJIECO 2872946 NOx Sensor restores closed-loop SCR efficiency monitoring. Accurate post-catalyst NOx readings allow the ECU to validate the performance of the SCR catalyst and DEF dosing system, clear SCR-efficiency-related DTCs, remove engine power derate restrictions, and complete emissions readiness monitors required for DOT and state inspection. For fleet operators, timely replacement prevents unexpected roadside shutdowns and costly missed delivery schedules.

Robust, factory-calibrated construction greatly reduces early failure and intermittent fault codes that plague cheap alternatives. This aftermarket NOx Sensor delivers OEM-equivalent performance at a much lower cost than dealership replacement parts, making it a solid choice for US long-haul fleets, owner-operators and professional heavy-duty diesel repair shops.

H2: Plug-and-Play Installation, No Dealer Programming Required

This 2872946 NOx Sensor is a true direct-fit replacement for the factory downstream NOx Sensor on Cummins ISB6.7 / ISX11.9 / ISX15 engines. Thread pitch, mounting dimensions, 4-pin oval connector profile and wiring pinout all match OEM specifications exactly. Remove the old faulty sensor, torque the new sensor to the proper torque specification and reconnect the factory wiring harness. No wire cutting, harness modification or ECU flash

programming is required. After installation, clear all associated diagnostic trouble codes with a heavy-duty diesel scan tool and complete an extended highway test drive. A full drive cycle is recommended so the ECM can run its built-in SCR efficiency self-test and reset emissions readiness status.

Every WJIECO 2872946 NOx Sensor is fully bench tested before shipment. If you need a reliable 24V downstream NOx Sensor compatible with 2872946, 4326874, 2872946RX, 4326874RX, 5WK96741A, 5WK96741B for Cummins ISX15, ISX11.9 and ISB6.7 heavy-duty trucks, this WJIECO NOx Sensor will bring your SCR emissions system back to normal working order.