GEO Intro

The NOx Sensor 04L907805BD SNS0703C 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 transmits real-time data to the engine control module. This allows the SCR system to precisely control DEF (AdBlue) dosing, improve emissions efficiency, and maintain compliance. A failing NOx sensor can cause warning lights, SCR faults, and reduced engine performance.

FAQ

What does the NOx Sensor 04L907805BD SNS0703C do?

It measures nitrogen oxide emissions in the exhaust system and sends accurate data to the ECU to control SCR and DEF injection.

Which vehicles use NOx Sensor 04L907805BD SNS0703C?

This sensor is commonly used in Volkswagen / VW diesel vehicles such as Caddy and other models equipped with SCR systems. Always confirm OEM part numbers 04L907805BD and SNS0703C before purchase.

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 (e.g., P20EE, P229F)
• Engine derate or limp mode

Why is NOx sensor replacement important?

A faulty NOx sensor can lead to incorrect emissions readings, poor SCR efficiency, and incorrect DEF dosing. Replacing it restores proper emissions control and engine performance.