WJIECO 4326871 NOx Sensor Durable. Cross references 5WK96764B, 4326871RX, A2C89789500-01. 12V upstream NOx Sensor for Cummins ISF2.8 and ISF3.8 CM2220 diesel engines. Fits Isuzu NPR, Fuso Canter, delivery box trucks and vocational light duty trucks, plug & play install.

4326871 NOx Sensor Overview

The 4326871 NOx Sensor manufactured by WJIECO is the upstream NOx sensor mounted before the SCR catalyst for light-duty delivery trucks and vocational vehicles powered by Cummins ISF2.8 and ISF3.8 CM2220 diesel engines. This upstream NOx Sensor reads NOx levels directly from engine-out exhaust, enabling the ECM to calculate the correct DEF injection rate to maintain emissions compliance.

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Accurate upstream NOx data is critical for stable SCR operation. If this NOx Sensor suffers signal drift, soot contamination, internal sensing element failure or CAN communication loss, the ECM will log NOx-related DTCs, illuminate the check engine light, trigger engine derate, and cause the vehicle to fail emissions inspection. Many delivery fleets and light diesel repair shops encounter intermittent faults that only surface under loaded driving conditions, which are classic signs of a degraded upstream NOx sensor. This sensor cross-references interchange numbers: 4326871, 4326871RX, 4326871C, 5WK96764B, A2C89789500-01, A2C8978950001 for quick part matching for fleet managers, independent repair shops and owner-operators across the United States.

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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.

H2: OEM-Grade Construction & Strict Factory Testing

Our 4326871 NOx Sensor uses 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 exhaust heat, constant engine vibration, rapid thermal cycling, soot buildup, plus road salt, mud and moisture exposure year-round on delivery box trucks and vocational vehicles. Low-cost generic NOx sensors often skip long-duration high-temperature burn-in calibration, which leads to signal drift and premature failure after only a short time in service.

Every finished 4326871 NOx Sensor passes a full set 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 rigorous QC process guarantees stable NOx readings, reliable CAN communication with the ECM and longer service life inside the demanding light-duty diesel exhaust environment.

H2: Vehicle Fitment (Amazon US Light Duty Box Truck Fitment List)

Compatible Cummins Engines: Cummins ISF2.8 CM2220 F129, ISF3.8 CM2220 F116 Diesel

• Isuzu: NPR, NPR-HD, NQR, NRR (ISF2.8 / ISF3.8)
• Fuso: Canter (ISF2.8 / ISF3.8)
• Ram ProMaster equipped with Cummins ISF powertrain
• Delivery box trucks, landscape trucks and vocational trucks with ISF2.8 / ISF3.8 CM2220

Important note: This is the 12V UPSTREAM NOx Sensor 5WK96764B. NOT compatible with ISB6.7, ISX15, ISB4.5 medium or heavy-duty engines, NOT compatible with 12V 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: 4326871, 4326871RX, 4326871C, 5WK96764B, A2C89789500-01, A2C8978950001

H2: Core Benefits of 4326871 NOx Sensor

Replacing your faulty upstream NOx Sensor with the WJIECO 4326871 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 state inspection. For delivery fleets, proactive replacement prevents unexpected downtime and missed delivery routes.

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 great fit for US delivery fleets, vocational truck operators and professional light-duty diesel repair facilities.

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

This 4326871 NOx Sensor is a true direct-fit replacement for the factory upstream NOx Sensor on Cummins ISF2.8 / ISF3.8 CM2220 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 diesel scan tool and perform a loaded test drive. A full drive cycle is recommended so the ECM can run its SCR self-test and reset emissions readiness status.

Every WJIECO 4326871 NOx Sensor is fully bench tested before shipment. If you need a reliable 12V upstream NOx Sensor compatible with 4326871 and 5WK96764B for Cummins ISF2.8 / ISF3.8 light-duty box trucks, this WJIECO NOx Sensor will return your SCR emissions system to normal operation.

Product Tags

4326871, 4326871RX, 4326871C, 5WK96764B, A2C89789500-01, A2C8978950001, NOx Sensor, Nitrogen Oxide Sensor, Cummins ISF2.8 NOx sensor, Cummins ISF3.8 NOx sensor, upstream NOx sensor, Isuzu NPR NOx sensor, box truck NOx sensor, light duty diesel NOx sensor, WJIECO exhaust sensor