Mercedes ML W163 SLK R170 M111 Lambda Sensor Oxygen Probe A0015402117

Mercedes ML W163 SLK R170 M111 Lambda Sensor Oxygen Probe is a component from the Lambda sensors and O2 sensors category, designed for precise control of the air-fuel mixture in Mercedes engines. This used, original sensor ensures proper cooperation with the factory engine control unit, which translates into stable engine operation and correct exhaust emission regulation.

Specifications and technical data

• SKU: A0015402117
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0015402117
• Substitutable numbers: A0015402117, A 001 540 21 17
• Category: Oxygen Sensors

Purpose and function of the lambda sensor

The described sensor belongs to the group of components responsible for measuring oxygen content in exhaust gases, which allows the engine control unit to continuously adjust the fuel dose. In Mercedes ML W163 and SLK R170 vehicles with the M111 engine, a properly functioning O2 sensor is crucial for:

• maintaining stable idle speed,
• correct response to accelerator pedal input,
• reducing fuel consumption under typical road conditions,
• meeting the emission standards specified for the given model.

Benefits of using an original Mercedes lambda sensor

Using a component from the Lambda sensors and O2 sensors group dedicated to Mercedes allows for maintaining the factory parameters of the fuel system. In practice, this means:

• consistent cooperation with the original engine control unit software,
• appropriate signal characteristics across the full range of operating temperatures,
• reduced risk of diagnostic errors related to the air-fuel mixture,
• easier data interpretation during computer diagnostics.

For the user, this translates into more predictable vehicle behavior and the ability to perform effective diagnostics should any irregularities occur.

Operational and installation characteristics

The lambda sensor works in direct contact with exhaust gases, which is why its condition has a significant impact on engine performance. Replacing a worn-out O2 sensor with a functional unit is recommended, among other things, in the event of symptoms such as:

• increased fuel consumption for no apparent reason,
• uneven engine operation after warming up,
• engine check light related to mixture correction.

Selecting the right sensor for a specific Mercedes version is facilitated by OEM markings and interchangeable numbers, which allow for verifying compatibility with a given engine and exhaust system configuration.

Condition of the component and practical application

The offered lambda sensor is a used component, which makes it an attractive solution for users looking for parts at a reasonable price while maintaining the manufacturer's original specifications. This type of component will work well both for standard exhaust system repairs and for restoring full functionality to older ML W163 or SLK R170 models with the M111 engine.

Choosing a used O2 sensor is particularly important in vehicles where maintaining the factory characteristics of the engine is essential, without experimenting with replacements of uncertain parameters.

More components from this group and technical knowledge

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

When deciding to install a used sensor, it is worth learning about the broader context of using second-hand electronics and measuring elements – you will find practical tips in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?, which discusses the selection and operation of used electronic components in cars.