Volkswagen Tiguan 5N Golf Mk 7.5 Diesel NOX Sensor Lambda Probe 04L907805BQ

Volkswagen Tiguan 5N Golf Mk 7.5 Diesel NOX Sensor Lambda Probe is a component from the Lambda probes and O2 sensors group, designed for Volkswagen diesel systems. It is responsible for the precise measurement of nitrogen oxide concentration in exhaust gases, which allows the engine control unit to effectively manage the combustion process and the operation of the exhaust gas treatment system in Diesel units.

Specifications and technical data

• SKU: 04L907805BQ
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 04L907805BQ
• Substitutable numbers: 04L907805BQ, 04L 907 805 BQ
• Fuel type: Diesel
• Category: Oxygen Sensors

Function of the NOX sensor in a Diesel engine

The NOX sensor in a diesel engine monitors the exhaust gas composition downstream of the filter and/or catalytic converter, transmitting information to the control unit that is essential for adjusting the fuel dose and the operation of the emission reduction system. As a result, the engine maintains stable operating parameters, and emission levels remain within the limits specified for the given model.

A functional NOX sensor helps reduce the risk of the engine entering limp mode, prevents excessive exhaust smoke, and supports the maintenance of proper fuel consumption. In vehicles such as the Tiguan 5N or Golf Mk 7.5, this has a direct impact on the engine's refinement and the correct operation of OBD diagnostic systems.

Benefits of using an original Volkswagen NOX lambda probe

Using an element from the group of original Volkswagen components ensures proper fitment with the electrical installation and exhaust system of a specific model. The sensor's precise measurement characteristics are crucial for correct cooperation with the factory engine control unit software, which limits the risk of errors and incompatibilities.

The main advantages of using this NOX probe in a diesel engine exhaust system include:

• stable reading of exhaust parameters across a wide range of engine loads,
• cooperation with the factory emission control system,
• maintaining compliance with factory engine operating strategies,
• reducing the risk of errors related to the exhaust gas treatment system.

Application in Volkswagen Tiguan 5N and Golf Mk 7.5 models

The presented NOX lambda probe is designed for the exhaust systems of diesel engines in Volkswagen Tiguan 5N and Golf Mk 7.5 models. Proper fitment for a specific engine version and vehicle year should always be verified based on the vehicle's technical data and manufacturer specifications, which helps avoid installation issues and system operation errors.

Replacing the NOX sensor is particularly recommended if diagnostic errors related to exhaust emissions, power loss, increased fuel consumption, or improper operation of the exhaust gas treatment system appear in Diesel units.

Product characteristics and condition

The offered item belongs to the Lambda probes and O2 sensors category, meaning it is part of the precise exhaust system measurement electronics. The product is in used condition, which in practice means it has been removed from a vehicle and verified for further serviceability. This type of solution allows for an economical vehicle repair while maintaining compliance with the factory system design.

Before installation, it is recommended to perform standard vehicle computer diagnostics and check the electrical installation to rule out other causes of improper exhaust emission system operation.

Technical support and selection of used electronics

For components such as the NOX sensor, correct selection for a specific model and engine version is crucial for the proper operation of the entire system. It is worth using catalog data and service documentation to ensure that the sensor parameters meet the vehicle's requirements.

If you want to better understand when choosing used automotive electronics is justified and how to safely select such components, read the article: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

If you are planning a comprehensive repair or upgrade of the exhaust system area in your Volkswagen and need other elements from the same group, such as additional probes, oxygen sensors, or exhaust gas composition sensors, check the available parts in the Volkswagen Lambda probes and O2 sensors category.