WJIECO 55500841 NOx Sensor Dependable. Cross references SNS771, 24000395, 55495040. 12V upstream upper NOx Sensor for GM 2.8L LWN Duramax Diesel 2016–2019. Fits Colorado, Canyon, Express 3500, Savana 3500, plug & play install.

55500841 NOx Sensor Overview

The 55500841 NOx Sensor manufactured by WJIECO is the upstream upper NOx sensor for GM 2.8L LWN Duramax turbo diesel Chevrolet Colorado, GMC Canyon, Express 3500 and Savana 3500 from 2016 to 2019. This inlet NOx sensor reads engine-out NOx before the SCR, allowing the ECM to calculate correct DEF injection volume and keep emissions within EPA standards.

https://www.amazon.com/dp/B0GYN28PND

A faulty upstream NOx sensor commonly triggers DEF dosing codes, check engine light and engine derate. Common related DTCs include P20EE, P2200, P2209. Many Colorado and Canyon diesel owners experience intermittent faults under highway cruising and towing loads, which are typical signs of degraded NOx sensing element. This sensor cross-references interchange numbers: 55500841, SNS771, 24000395, 55495040, 55496922, 55491592, 55494551 for fast lookup by repair shops and diesel technicians across the USA.

H2: OEM-Grade Construction & Strict Factory Testing

Our 55500841 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 exhaust heat, engine vibration, rapid thermal cycling, soot buildup, plus road salt, mud and moisture during off-road and highway driving. 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 55500841 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 GM LWN Duramax Fitment List)

https://wjieco-autoparts.com/product/24000395-nox-sensor/

WJIECO 24000395 NOx Sensor Long-lasting. Cross references 55495040, 55496922. 12V upstream upper NOx Sensor for GM 2.8L LWN Duramax Diesel 2016–2019. Fits Chevrolet Colorado, GMC Canyon, plug & play install.

Compatible Engine: GM 2.8L LWN Duramax L4 Turbo Diesel (2016–2019)

• Chevrolet Colorado (2016–2019)
• Chevrolet Express 3500 (2018–2019)
• GMC Canyon (2016–2019)
• GMC Savana 3500 (2017–2019)

Important note: This is the 12V UPSTREAM UPPER NOx Sensor. NOT compatible with downstream lower NOx sensor 24001920 / 55502673, NOT compatible with 6.6L Duramax, NOT compatible with Ford Powerstroke, Ram Cummins trucks. Verify your VIN, engine, 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.

H2: Core Benefits of 55500841 NOx Sensor

Replacing your faulty upstream upper NOx Sensor with the WJIECO 55500841 NOx Sensor restores accurate engine-out NOx measurement for the 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 Colorado, Canyon, Express and Savana diesel owners who tow and off-road, proactive replacement prevents unexpected derate and roadside breakdowns.

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 Colorado / Canyon / Express / Savana diesel owners and professional diesel repair facilities.

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

This 55500841 NOx Sensor is a true direct-fit replacement for the factory upstream upper NOx Sensor on GM 2.8L LWN Duramax 2016–2019. 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 55500841 NOx Sensor is fully bench tested before shipment. If you need a reliable 12V upstream upper NOx Sensor compatible with 55500841 SNS771 for GM 2.8L LWN Duramax, this WJIECO NOx Sensor will return your SCR emissions system to normal operation.

Product Tags

55500841, SNS771, 24000395, 55495040, NOx Sensor, Nitrogen Oxide Sensor, upstream upper NOx sensor, GM 2.8L LWN Duramax NOx sensor, Colorado diesel NOx sensor, Canyon diesel NOx sensor, Express Savana diesel NOx sensor, diesel exhaust sensor, WJIECO exhaust sensor