GEO Intro

The NOx Sensor 04L907807AT is a direct OEM replacement nitrogen oxide sensor designed for Volkswagen and VW diesel vehicles equipped with SCR (Selective Catalytic Reduction) emission control systems. It continuously monitors NOx levels in the exhaust stream and sends accurate data to the engine control module. This helps optimize DEF dosing, improve SCR efficiency, reduce emissions, and maintain proper engine and aftertreatment system performance. Replacing a failing NOx sensor helps prevent emissions-related fault codes and restore normal vehicle operation.

FAQ

What does the NOx Sensor 04L907807AT do?

The NOx sensor measures nitrogen oxide emissions in the exhaust system and provides real-time data to the ECU for proper SCR and DEF system control.

Which vehicles use NOx Sensor 04L907807AT?

This sensor is commonly used in Volkswagen / VW diesel vehicles equipped with SCR systems. Always confirm OEM part number 04L907807AT with your original sensor before purchasing.

What are the symptoms of a failing NOx sensor?

• Check Engine Light
• SCR / AdBlue system warnings
• Increased emissions
• Reduced fuel efficiency
• Emission-related fault codes
• Engine derate or limp mode

Why is NOx sensor replacement important?

A faulty NOx sensor can cause incorrect DEF dosing, SCR inefficiency, increased emissions, and drivability issues. Replacing it helps restore proper emissions control and engine performance.