WJIECO 4326870 NOx Sensor Durable. Cross references 4326870RX, 5WK96740B, 904-6009, 2872944, 3687930. 12V Gen2.7 upstream inlet NOx Sensor for Cummins ISX11.9, ISX15, X15, QSX15 EPA10/GHG17 diesel engines. Fits Freightliner Cascadia, Kenworth T680, Peterbilt 579, International ProStar, Western Star, Pierce fire trucks, plug & play install.

4326870 NOx Sensor Overview

The 4326870 NOx Sensor manufactured by WJIECO is the Gen2.7 upstream inlet NOx sensor mounted before the SCR catalyst for Class 8 over-the-road trucks and fire apparatus powered by Cummins ISX11.9, ISX15 and X15 diesel engines. This inlet NOx Sensor reads raw NOx levels exiting the engine, enabling the ECM to calculate the exact DEF injection rate required to keep exhaust emissions compliant with EPA standards.

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Accurate upstream NOx readings are the foundation of stable closed-loop SCR operation. 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 such as P2201, P2202, P2203, turn on 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 upstream NOx sensor. This sensor cross-references interchange numbers: 4326870, 4326870RX, 4326870NX, 5WK96740B, 904-6009, 2872944, 2872944NX, 3687930, 3687930RX, A2C85990700, A045S167 for fast part lookup for fleet managers and independent diesel repair shops across the USA.

H2: OEM-Grade Construction & Strict Factory Testing

Our 4326870 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 fire equipment. 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.

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WJIECO 4326872 NOx Sensor Durable Cross references 4326872RX, A045S169, 5WK96749A, 5WK96749B. OEM-grade downstream NOx Sensor for 2013–2018 Dodge Ram 2500 3500 4500 5500 6.7L Cummins Diesel. SCR monitoring, plug & play install.

Every finished 4326870 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 Heavy Duty Fitment List)

Compatible Cummins Engines: Cummins ISX11.9, ISX15, X15, QSX15 EPA10 / GHG17 Diesel (2013–2018)

• Freightliner: Cascadia, Coronado, Argosy
• Kenworth: T660, T680, T700, T800, T880, W900, C500
• Peterbilt: 367, 384, 389, 567, 579, 587
• International: ProStar, LoneStar, WorkStar, LT
• Western Star: 4700, 4900, 5700XE
• Pierce: Fire Truck (ISX15 chassis)

Important note: This is the 12V Gen2.7 UPSTREAM INLET NOx Sensor, 5WK96740B. NOT compatible with ISB6.7, ISL9, ISX12 engines, NOT compatible with Ram 2500/3500 pickup trucks. 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: 4326870, 4326870RX, 4326870NX, 5WK96740B, 904-6009, 2872944, 2872944NX, 3687930, 3687930RX, A2C85990700, A045S167

H2: Core Benefits of 4326870 NOx Sensor

Replacing your faulty upstream inlet NOx Sensor with the WJIECO 4326870 NOx Sensor restores accurate engine-out NOx measurement for the SCR DEF dosing system. Reliable upstream NOx readings allow the ECM to maintain proper DEF injection rates, 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, proactive replacement prevents unexpected roadside downtime and costly delivery 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 4326870 NOx Sensor is a true direct-fit replacement for the factory upstream inlet NOx Sensor on Cummins ISX11.9 / ISX15 / X15 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 self-test and reset emissions readiness status.

Every WJIECO 4326870 NOx Sensor is fully bench tested before shipment. If you need a reliable 12V Gen2.7 upstream inlet NOx Sensor compatible with 4326870 and 5WK96740B for Cummins ISX15 / X15 Class 8 trucks, this WJIECO NOx Sensor will return your SCR emissions system to normal operation.

Product Tags

4326870, 4326870RX, 5WK96740B, 904-6009, 2872944, 3687930, NOx Sensor, Nitrogen Oxide Sensor, Cummins ISX15 NOx sensor, Cummins X15 NOx sensor, upstream inlet NOx sensor, Freightliner Cascadia NOx sensor, Kenworth T680 NOx sensor, Peterbilt 579 NOx sensor, class 8 heavy duty NOx sensor, WJIECO exhaust sensor