WJIECO 12669594 NOx Sensor Long-lasting. Cross references 5WK96631H, 12671387, 12642310. 12V upstream inlet NOx Sensor for GM 6.6L LML Duramax Diesel 2011–2015. Fits Silverado, Sierra, Express 3500/4500, Savana 3500/4500, plug & play install.

12669594 NOx Sensor Overview

The 12669594 NOx Sensor manufactured by WJIECO is the upstream inlet NOx sensor for GM 6.6L LML Duramax turbo diesel Chevrolet Silverado, Express and GMC Sierra, Savana from 2011 to 2015. This pre-SCR NOx sensor reads engine-out NOx before the SCR, allowing the ECM to calculate correct DEF injection volume and keep emissions within EPA standards.

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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 LML 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: 12669594, 5WK96631H, 12671387, 12642310 for fast lookup by repair shops and diesel technicians across the USA.

H2: OEM-Grade Construction & Strict Factory Testing

Our 12669594 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 heavy-duty towing and work truck use. 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 12669594 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 Turbo Diesel (2011–2015)

• Chevrolet Silverado 2500HD / 3500HD (2011–2015)
• Chevrolet Express 3500 / 4500 (2012–2015)
• GMC Sierra 2500HD / 3500HD (2011–2015)
• GMC Savana 3500 / 4500 (2012–2015)

Important note: This is the 12V UPSTREAM INLET POSITION 1 NOx Sensor. NOT compatible with downstream NOx sensor 12669595, NOT compatible with L5P / LB7 / LLY / LBZ / LMM 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 12669594 NOx Sensor

Replacing your faulty upstream inlet NOx Sensor with the WJIECO 12669594 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 LML Duramax owners who tow heavy loads or run work vans, 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 LML Duramax truck and van owners and professional diesel repair facilities.

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

This 12669594 NOx Sensor is a true direct-fit replacement for the factory upstream inlet NOx Sensor on GM 6.6L LML Duramax 2011–2015. 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 12669594 NOx Sensor is fully bench tested before shipment. If you need a reliable 12V upstream NOx Sensor compatible with 12669594 5WK96631H for GM 6.6L LML Duramax, this WJIECO NOx Sensor will return your SCR emissions system to normal operation.

Product Tags

12669594, 5WK96631H, 12671387, 12642310, NOx Sensor, Nitrogen Oxide Sensor, upstream inlet NOx sensor, GM 6.6L LML Duramax NOx sensor, Silverado diesel NOx sensor, Sierra diesel NOx sensor, Express Savana diesel NOx sensor, LML NOx sensor, diesel exhaust sensor, WJIECO exhaust sensor

https://wjieco-autoparts.com/product/12680215-nox-sensor/

WJIECO 12680215 NOx Sensor Dependable. Cross references SNS317A, 12718742, 12680619. 12V upstream position 1 NOx Sensor for GM 6.6L L5P Duramax Diesel 2017–2019. Fits Silverado 2500HD 3500HD, Sierra 2500HD 3500HD, plug & play install.