BMW G20 G21 G11 G12 Diesel Nox Lambda Sensor 8477724

BMW G20 G21 G11 G12 Diesel Nox Lambda Sensor is a specialized component from the Lambda probes and O2 sensors category, designed for BMW diesel systems. It is responsible for the precise measurement of nitrogen oxide and oxygen content in exhaust gases, which allows the engine control unit to ensure stable, efficient, and more economical operation of the powertrain.

Specifications and technical data

• SKU: 8477724
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8477724
• Substitutable numbers: 8477724, 13628477724
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and function in the exhaust system

The presented NOx/lambda sensor is dedicated to Diesel engines in selected BMW G20, G21, G11, and G12 series models. Its task is to continuously monitor the composition of exhaust gases in the exhaust system, which enables the proper operation of the exhaust gas treatment system, including the catalytic converter and the nitrogen oxide emission reduction system.

Thanks to precise measurements, the sensor supports:

• maintaining stable operating parameters of the diesel engine,
• limiting the emission of harmful compounds,
• reducing the risk of the unit entering limp mode,
• proper cooperation with the engine control unit software.

Benefits of using an original BMW sensor

Using a component from the Lambda probes and O2 sensors category dedicated to a specific BMW platform allows for maintaining the factory performance characteristics of the powertrain. Proper matching of electrical parameters and measurement characteristics translates into:

• consistent cooperation with the factory ECU software,
• stable values for fuel dose corrections and exhaust system operation,
• reduced risk of errors related to exhaust emissions.

This solution is particularly recommended when diagnosing problems with emissions, power loss, or increased fuel consumption in BMW diesel engines.

Characteristics and application in diesel engines

The NOx/lambda sensor in Diesel units operates in a demanding thermal and chemical environment, which is why its proper functioning is essential for the durability of the entire exhaust system. In BMW G20, G21, G11, and G12 series vehicles, it is responsible for, among other things:

• monitoring the efficiency of the catalytic converter and the NOx reduction system,
• ongoing adjustment of fuel injection strategies,
• maintaining compliance with emission standards provided for a given model.

Replacing a faulty sensor with a functional unit of this type is one of the key stages in the professional repair of the exhaust gas treatment system in modern BMW diesel engines.

Product condition and service application

The offered component is in used condition, which allows for an economical vehicle repair while maintaining the correct operating parameters of the system. This type of solution is often chosen in professional workshops specializing in the diagnostics and service of modern diesel units, where both operational correctness and cost optimization are important.

Before installation, it is recommended to perform a standard vehicle diagnostic procedure and verify the correct selection of the sensor for the specific configuration of the BMW engine and exhaust system.

If you are planning a comprehensive repair or upgrade of the exhaust system area in your BMW and need other components from the same group, such as pre-catalyst sensors, post-catalyst sensors, or additional oxygen sensors, check the available parts in the BMW Lambda probes and O2 sensors category.

More about used electronics and sensors in the car

When selecting used measurement and electronic components, it is worth following proven diagnostic procedures and knowledge regarding component compatibility. To better understand when choosing a used sensor or module is justified and how to minimize the risk of incorrect selection, check out our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.