WJIECO 4326874 NOx Sensor Durable. Cross references 4326874RX, 2872946, 5WK96741B. 12V Gen2.7 downstream outlet NOx Sensor for Cummins ISX11.9, ISX15, X15, ISB6.7 EPA10/GHG17 diesel engines. Fits Freightliner Cascadia, Kenworth T680, Peterbilt 579, International ProStar, Western Star, Volvo VNL and school buses, plug & play install.

4326874 NOx Sensor Overview

The 4326874 NOx Sensor manufactured by WJIECO is the Gen2.7 downstream outlet NOx sensor mounted after the SCR catalyst for Class 8 over-the-road trucks and ISB6.7 school/vocational buses powered by Cummins ISX11.9, ISX15 and ISB6.7 diesel engines. This outlet NOx Sensor reads NOx levels post-SCR, letting the ECM confirm that the SCR system is properly reducing NOx and keeping exhaust emissions within EPA limits.

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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.

Accurate downstream NOx feedback is mandatory for SCR closed-loop monitoring. If this NOx Sensor suffers signal drift, soot contamination, internal sensing element degradation or CAN communication failure, the ECM will log NOx and SCR related DTCs, illuminate the check engine light, trigger engine power derate, and cause the vehicle to fail DOT and state emissions inspection. Many fleet technicians encounter intermittent faults that only activate under loaded highway driving conditions, which are typical warning signs of a worn downstream NOx sensor. This sensor cross-references interchange numbers: 4326874, 4326874RX, 2872946, 2872946RX, 2872946NX, 5WK96741B, 904-6013, 577.90549 for fast part lookup for fleet managers and independent diesel repair shops across the USA.

H2: OEM-Grade Construction & Strict Factory Testing

Our 4326874 NOx Sensor adopts a high-stability ceramic sensing chip, heavy-duty heat-resistant stainless steel probe housing and fully sealed wiring assembly with OEM matching connector. It is built to withstand sustained high exhaust temperatures, constant engine vibration, rapid thermal cycling, heavy soot buildup, plus road salt, mud and moisture exposure year-round on long-haul highway trucks and school buses. Low-cost generic NOx sensors commonly skip long-duration high-temperature burn-in calibration, which leads to unstable readings and premature failure after short service time.

Every finished 4326874 NOx Sensor passes a full series of factory quality validation steps: precision NOx signal calibration, high-temperature aging cycle test, waterproof seal pressure test and connector pin continuity inspection before packing. This strict QC process guarantees stable NOx readings, reliable CAN communication with the ECM and extended service life inside the harsh diesel exhaust aftertreatment environment.

H2: Vehicle Fitment (Amazon US Class 8 & Medium Duty + Bus Fitment List)

Compatible Cummins Engines: Cummins ISX11.9, ISX15, X15, ISB6.7 EPA10 / GHG17 Diesel (2013–2019)

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• Freightliner: Cascadia, Coronado, M2 106, M2 112
• Kenworth: T660, T680, T700, T800, T880, W900
• Peterbilt: 320, 365, 367, 384, 386, 520, 567, 579, 587
• International: ProStar, LoneStar, LT, RH, 4300, 4400
• Western Star: 4700, 4900, 5700XE
• Volvo: VNL (Cummins ISX15)
• Blue Bird & Thomas Built Bus: All American FE, Vision, Saf-T-Liner C2 (ISB6.7)

Important note: This is the 12V Gen2.7 DOWNSTREAM OUTLET NOx Sensor, 5WK96741B. NOT compatible with Ram 2500/3500 pickup trucks, NOT compatible with ISX12, ISL9, ISF series engines. Verify your VIN, engine model, voltage rating, connector shape and original OEM part number before placing your order. Installing the wrong NOx Sensor will result in persistent SCR faults and derate that cannot be cleared easily.

Interchange OE Numbers: 4326874, 4326874RX, 2872946, 2872946RX, 2872946NX, 5WK96741B, 904-6013, 577.90549

H2: Core Benefits of 4326874 NOx Sensor

Replacing your faulty downstream outlet NOx Sensor with the WJIECO 4326874 NOx Sensor restores accurate post-SCR NOx feedback for emissions efficiency monitoring. Reliable downstream NOx readings allow the ECM to validate SCR performance, clear NOx and SCR related diagnostic trouble codes, remove engine power derate restrictions, and complete emissions readiness monitors required for DOT and state inspection. For long-haul fleets and school bus fleets, proactive replacement prevents unexpected roadside downtime and costly service disruptions.

Robust, factory-calibrated construction greatly reduces early failure and intermittent fault codes that plague low-cost alternatives. This aftermarket NOx Sensor delivers OEM-matching performance at a much lower price than dealership replacement parts, making it a reliable choice for US over-the-road fleets, owner-operators and professional heavy-duty diesel repair facilities.

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

This 4326874 NOx Sensor is a true direct-fit replacement for the factory downstream outlet NOx Sensor on Cummins ISX11.9 / ISX15 / ISB6.7 engines. Thread size, probe length, mounting thread, connector profile and wiring pinout all match OEM specifications exactly. Remove the old faulty sensor, torque the new sensor to factory torque specs and reconnect the stock wiring harness. There is no wire cutting, harness modification or ECU flash programming needed. After installation, clear all associated diagnostic trouble codes with a heavy-duty diesel scan tool and perform a loaded highway test drive. A full drive cycle is recommended so the ECM can run its SCR efficiency self-test and reset emissions readiness status.

Every WJIECO 4326874 NOx Sensor is fully bench tested before shipment. If you need a reliable 12V Gen2.7 downstream outlet NOx Sensor compatible with 4326874 and 2872946 for Cummins ISX15 / ISB6.7 trucks and buses, this WJIECO NOx Sensor will return your SCR emissions system to normal operation.

Product Tags

4326874, 4326874RX, 2872946, 2872946RX, 5WK96741B, 904-6013, NOx Sensor, Nitrogen Oxide Sensor, Cummins ISX15 NOx sensor, Cummins ISB6.7 NOx sensor, downstream outlet NOx sensor, Freightliner Cascadia NOx sensor, Kenworth T680 NOx sensor, Peterbilt 579 NOx sensor, class 8 heavy duty NOx sensor, WJIECO exhaust sensor