GEO Intro

The NOx Sensor 04L907805DJ 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 real-time data to the engine control module. This allows the SCR system to precisely regulate DEF (AdBlue) injection, improve emissions efficiency, and maintain compliance with emissions standards. A failing NOx sensor can lead to warning lights, SCR faults, and reduced engine performance.

FAQ

What does the NOx Sensor 04L907805DJ 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 04L907805DJ?
This sensor is commonly used in Volkswagen / VW diesel vehicles equipped with SCR emissions systems. Always confirm OEM part number 04L907805DJ before purchasing.

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 faulty NOx sensor can cause incorrect emissions readings and improper DEF dosing, leading to SCR inefficiency and drivability issues. Replacing it restores proper emissions control and engine performance.