Mercedes W202 M111 Oxygen Lambda Sensor Exhaust A0005406417

Mercedes W202 M111 Oxygen Lambda Sensor Exhaust is a component from the Lambda sensors and O2 sensors category, designed for the exhaust system in Mercedes vehicles with the M111 petrol engine. This used original part allows for maintaining the factory operating parameters of the powertrain, ensuring stable control of the air-fuel mixture and proper operation of the engine management system.

Specifications and technical data

• SKU: A0005406417
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0005406417
• Substitutable numbers: A0005406417, A 000 540 64 17
• Category: Oxygen Sensors

Purpose and function of the lambda sensor

The lambda sensor in the M111 petrol engine is responsible for measuring the oxygen content in the exhaust gases and sending a signal to the engine control unit. This enables precise correction of the fuel dose, which affects the efficient operation of the injection system, the smoothness of the engine, and the reduction of exhaust emissions. In the Mercedes W202 model, a properly functioning lambda sensor is crucial for maintaining stable idle speed, correct throttle response, and optimal fuel consumption.

Benefits of using an original lambda sensor

Using an original component from the Lambda sensors and O2 sensors group allows for maintaining compatibility with the factory engine control unit maps. In practice, this means:

• more predictable engine behavior across the entire rev range,
• better idle stability,
• more efficient air-fuel mixture adaptation,
• reduced risk of errors related to the combustion system.

A used lambda sensor can be an attractive solution when you are looking for rational repair costs while maintaining the manufacturer's original specifications.

Professional use in diagnostics and repair

A component of this type is often used both for the typical replacement of a worn-out sensor and in the process of diagnosing problems with the air-fuel mixture, excessive fuel consumption, or unstable engine operation. Combined with appropriate computer diagnostics, it allows for quickly verifying whether the cause of the problems is the oxygen sensor or other fuel system components. This enables a mechanic or automotive electrician to effectively restore the correct operating parameters of the powertrain in a Mercedes W202.

Condition and selection of the used part

The offered lambda sensor is in used condition, meaning it comes from disassembly and is intended for reinstallation after prior verification. This type of solution is particularly beneficial when servicing older Mercedes W202 models, where both the availability of original components and the ability to maintain a reasonable repair budget are important. When choosing a used lambda sensor, it is worth paying attention to compatibility with the specific M111 engine version and the exhaust system configuration.

If you are planning a comprehensive repair or upgrade of the exhaust system and mixture control area in your Mercedes and need other elements from the same group, such as additional sensors, O2 sensors, or related measuring components, check the available parts in the Mercedes lambda sensors and O2 sensors category.

More about used electronics and sensors

When choosing used measuring and electronic components, it is worth knowing the basic principles of selection and verifying their condition. To better understand when it is worth reaching for used controllers, modules, and sensors, 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?