GEO Intro

The NOx Sensor 04L907805CB 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 measures NOx levels in the exhaust stream and sends accurate real-time data to the engine control module. This allows the SCR system to precisely control DEF (AdBlue) injection, improve emissions efficiency, and maintain compliance with environmental standards. A faulty NOx sensor can lead to warning lights, increased emissions, and reduced engine performance.

FAQ

What does the NOx Sensor 04L907805CB do?

The NOx sensor detects nitrogen oxide emissions in the exhaust and provides data to the ECU to regulate SCR and DEF system operation.

Which vehicles use NOx Sensor 04L907805CB?

This sensor is commonly used in Volkswagen / VW diesel vehicles with SCR emissions systems. Always confirm OEM part number 04L907805CB before ordering.

What are the symptoms of a failing NOx sensor?

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

Why is NOx sensor replacement important?

A defective NOx sensor can cause incorrect DEF dosing, SCR inefficiency, and drivability issues. Replacing it restores proper emissions control and engine operation.