Lambda Sensor Mercedes ML W164 W203 C209 Petrol Oxygen Sensor Probe A0015404617

Lambda Sensor Mercedes ML W164 W203 C209 Petrol Oxygen Sensor Probe is an original lambda sensor from the Lambda sensors and O2 sensors group, designed for Mercedes petrol engines. This component, mounted on the right side of the exhaust system, allows for precise exhaust gas composition measurement and stable engine control unit operation. Using an OEM component is a sensible choice for professional repairs when you prioritize factory fitment and predictable performance parameters.

Specifications and technical data

• SKU: A0015404617
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0015404617
• Substitutable numbers: A0015404617, A 001 540 46 17
• Location on the vehicle: Right
• Fuel type: Petrol
• Category: Oxygen Sensors

Function of the lambda sensor in a Mercedes petrol engine

The lambda sensor in a petrol engine is responsible for continuously measuring the oxygen content in the exhaust gases and sending a signal to the engine control unit. Based on this, the ECU adjusts the fuel dosage, keeping the mixture within the optimal range. A properly functioning O2 sensor:

• stabilizes engine operation at idle and under load,
• reduces fuel consumption through precise mixture dosing,
• supports efficient catalytic converter operation and exhaust emission reduction,
• minimizes the risk of the engine check light related to the exhaust system illuminating.

In Mercedes ML W164, W203, and C209 models, using the correct lambda sensor on the right side of the exhaust system is crucial for the control unit to correctly interpret signals and maintain factory injection maps.

Vehicle placement and fitment

The presented lambda sensor is intended for installation on the right side of the exhaust system, which is important when selecting parts for vehicles with multiple O2 sensors. In Mercedes petrol engines, it is essential to maintain the correct distinction between the left and right sides so that the control unit receives correct data from the appropriate cylinder bank.

Selecting a sensor for a specific vehicle should be based on the OEM number and interchangeable numbers visible in the technical specification. This ensures that the sensor will work correctly with the electrical system and the control unit used in your Mercedes.

Benefits of using an original lambda sensor

Using an original lambda sensor in a petrol Mercedes provides measurable operational benefits. A sensor designed for specific engines ensures:

• stable performance parameters across the full range of temperatures and loads,
• correct control unit response to changes in mixture composition,
• better compatibility with the factory exhaust system and catalytic converter,
• reduced risk of diagnostic errors related to incorrect sensor signals.

Using an OEM element is a compromise between cost and quality – you maintain factory fitment and performance characteristics, which is particularly important in modern Mercedes petrol units.

Condition, application, and installation tips

The offered lambda sensor is in used condition, which in practice means it has been removed from a vehicle and is intended for reinstallation. Before installation, standard service procedures are recommended: checking the thread in the manifold or exhaust pipe, using appropriate anti-seize paste for sensors, and verifying the wiring harness for mechanical damage.

After installation, it is worth performing an adaptation or resetting parameters in the engine control unit using a suitable diagnostic tester so that the ECU can correctly interpret the signal from the newly installed sensor. If additional errors appear in the control unit memory, they should be diagnosed independently, as they are not always directly related to the O2 sensor.

More items from this group and knowledge about used electronics

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

When selecting used sensors and electronic components, it is worth knowing the basic principles of selection and diagnostics for such components – you can 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, among other things, cost-effectiveness, condition verification, and best installation practices.