GEO Intro

The NOx Sensor 04L907805DH 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 enables precise DEF (AdBlue) dosing, improves SCR efficiency, reduces emissions, and helps maintain full compliance with emissions regulations. A failing NOx sensor can trigger warning lights, SCR system faults, and reduced engine performance.

FAQ

What does the NOx Sensor 04L907805DH do?
The NOx sensor measures nitrogen oxide emissions in the exhaust system and provides real-time data to the ECU for accurate SCR and DEF system operation.

Which vehicles use NOx Sensor 04L907805DH?
This sensor is commonly used in Volkswagen / VW diesel vehicles equipped with SCR emission systems. Always confirm OEM part number 04L907805DH 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.