WJIECO 12671387 NOx Sensor Dependable. Cross references Continental 5WK96631H, 19256343, 12669594. 12V upstream front inlet NOx Sensor for GM 6.6L LML Duramax Diesel 2010–2015. Fits Silverado, Sierra, Express, Savana, plug & play install.

12671387 NOx Sensor Overview

The 12671387 NOx Sensor manufactured by WJIECO is the front upstream inlet NOx sensor for GM 6.6L LML Duramax diesel trucks and vans from 2010 to 2015. 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 limits.

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A faulty upstream NOx sensor commonly triggers DEF dosing codes, check engine light and engine derate. Common related DTCs include P20EE, P2200, P2209. Many Duramax owners experience intermittent faults under heavy towing and highway cruising loads, which are typical signs of degraded NOx sensing element. This sensor cross-references interchange numbers: 12671387, 5WK96631H, 19256343, 12669594, 19302359, 19301328, 5WK96631, 5WK96631D, 5WK96631G for fast lookup by repair shops and diesel technicians across the USA.

H2: OEM-Grade Construction & Strict Factory Testing

Our 12671387 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 towing 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 12671387 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 LML Duramax Fitment List)

Compatible Engine: GM 6.6L LML Duramax V8 Diesel (2010–2015)

• Chevrolet Silverado 2500HD, 3500HD (2011–2015)
• Chevrolet Express 2500, 3500, 4500 (2010–2015)
• GMC Sierra 2500HD, 3500HD (2011–2015)
• GMC Savana 2500, 3500, 4500 (2010–2015)

Important note: This is the 12V UPSTREAM FRONT INLET NOx Sensor, Continental 5WK96631H. NOT compatible with L5P Duramax, NOT compatible with LB7/LLY/LBZ/LMM, 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 12671387 NOx Sensor

Replacing your faulty upstream front inlet NOx Sensor with the WJIECO 12671387 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 Duramax owners who tow and haul, proactive replacement prevents unexpected derate and roadside breakdowns.

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WJIECO 19302359 NOx Sensor Long-lasting. Cross references 5WK96631, 19301328. 12V upstream front inlet NOx Sensor for GM 6.6L LML Duramax Diesel 2015–2016. Fits Silverado, Sierra, Express, Savana, plug & play install.

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 Duramax owners and professional diesel repair facilities.

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

This 12671387 NOx Sensor is a true direct-fit replacement for the factory upstream front inlet NOx Sensor on GM 6.6L LML Duramax 2010–2015. 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 12671387 NOx Sensor is fully bench tested before shipment. If you need a reliable 12V upstream front inlet NOx Sensor compatible with 12671387 and Continental 5WK96631H for GM 6.6L LML Duramax, this WJIECO NOx Sensor will return your SCR emissions system to normal operation.

Product Tags

12671387, 5WK96631H, 19256343, 12669594, 19302359, 19301328, NOx Sensor, Nitrogen Oxide Sensor, upstream front inlet NOx sensor, GM Duramax NOx sensor, Silverado 2500HD NOx sensor, Sierra 3500HD NOx sensor, Express Savana NOx sensor, LML 6.6L diesel sensor, WJIECO exhaust sensor