Standard Ignition NOX049 Nitrogen Oxide (NOx) Sensor - Upstream

NOx Sensor for GM Diesel Emissions Monitoring

Standard Ignition NOX049 is a nitrogen oxide sensor for upstream exhaust monitoring on select Cadillac, Chevrolet, and GMC diesel applications. It supports emissions system feedback for vehicles such as the Cadillac Escalade, Chevrolet Silverado 1500, and GMC Sierra 1500.

Key Features

• Nitrogen oxide (NOx) sensor for emission control system monitoring
• Upstream position application
• Female connector with rectangular shape
• 1 connector, 4 male pin terminals
• Direct-fit style replacement for select GM vehicles
• Cross-reference part numbers include 12686784 and DNX049

Detailed Description

Standard Ignition NOX049 is built for upstream NOx sensing in the exhaust stream, where accurate nitrogen oxide measurement is critical to diesel emissions management. The connector design includes one rectangular female connector with four male pin terminals, supporting a secure electrical interface for the sensor circuit. This part number is also referenced as 12686784 and DNX049 for the same application. Standard Ignition NOX049 is listed for 2021-2023 Cadillac Escalade and Escalade ESV, 2021-2023 Chevrolet Tahoe, 2022-2023 Chevrolet Silverado 1500, 2022 Chevrolet Silverado 1500 LTD, 2021-2023 GMC Yukon and Yukon XL, and 2022-2023 GMC Sierra 1500, plus 2022 GMC Sierra 1500 Limited.

What It Helps Address

• NOx sensor fault codes related to upstream exhaust monitoring
• Emission system warning lights tied to nitrogen oxide measurement
• Incorrect exhaust gas feedback to the engine control system
• Driveability issues caused by failed emissions sensor input
• Inspection failures linked to a malfunctioning NOx sensor

Installation Notes and Tips

Verify the connector style, terminal count, and upstream position before installation. Confirm vehicle year, make, and model against the listed fitment for Cadillac Escalade, Chevrolet Silverado 1500, Chevrolet Tahoe, GMC Sierra 1500, and related GM applications. Inspect the harness connector and exhaust-side mounting point for corrosion, heat damage, or contamination before connecting the new sensor.

Quality Assurance

Standard Ignition supplies emission control components for select OE-style replacement applications. Use the part number NOX049 to confirm the correct sensor for your vehicle before ordering.