GEO Intro

The NOx Sensor 55515864 is a direct replacement sensor designed for GM diesel vehicles equipped with SCR emission control systems. It continuously monitors nitrogen oxide (NOx) levels in the exhaust stream and transmits accurate data to the engine control module. A properly functioning NOx sensor helps optimize SCR aftertreatment performance, maintain emissions compliance, reduce fault codes, and prevent engine derate conditions caused by emission system malfunctions.

FAQ

What does the NOx Sensor 55515864 do?

The NOx sensor measures nitrogen oxide emissions in the exhaust system and provides real-time data to the engine control module for effective SCR emissions control and engine efficiency.

What are the symptoms of a failing NOx sensor?

• Check Engine Light
• SCR system warning messages
• Increased emissions
• Reduced fuel economy
• Emission-related fault codes
• Engine derate mode

Can a faulty NOx sensor affect SCR system operation?

Yes. Incorrect NOx readings can interfere with SCR system performance, trigger warning lights, and generate emissions-related diagnostic trouble codes.

Why should I replace a failed NOx sensor?

Replacing a defective NOx sensor helps restore accurate emissions monitoring, improve SCR system efficiency, maintain emissions compliance, and support reliable engine performance.