Standard Motor Products NOX031 Diesel Nitrogen Oxide NOx Sensor

The Standard Motor Products NOX031 is a direct-fit OE replacement Diesel Nitrogen Oxide (NOx) Sensor engineered to monitor nitrogen oxide levels in diesel exhaust systems. Designed to meet or exceed original equipment specifications, this sensor helps ensure your vehicle remains compliant with emissions regulations while supporting proper engine management and performance.

How It Works:

NOx sensors are high-temperature devices that detect nitrogen oxide concentrations in the exhaust stream. Diesel engines typically use two NOx sensors — an upstream sensor near the turbocharger outlet to measure engine-out NOx, and a downstream sensor to monitor NOx exiting the Selective Catalytic Reduction (SCR) catalyst. Together, they allow the engine control unit (ECU) to regulate diesel exhaust fluid (DEF) injection and maintain optimal SCR system efficiency.

Key Features:

• Direct-fit OE replacement — ensures proper fit, form, and function with no modification required
• Plug-and-play design — no additional programming or calibration required after installation
• High-temperature construction — built to withstand the extreme conditions of diesel exhaust environments
• Emissions compliance — helps keep diesel vehicles in compliance with state and federal NOx emissions regulations
• Manufactured by Standard Motor Products — a trusted name in OE-quality emissions and engine management components

Common Symptoms of a Failing NOx Sensor:

• Check engine light illumination
• Decreased fuel efficiency or engine performance
• Increased exhaust emissions or failed emissions test
• SCR system fault codes or DEF system warnings

The NOX031 is part of Standard Motor Products' professional-grade diesel sensor line, designed to restore factory exhaust monitoring accuracy and extend the service life of downstream emissions components.