Mercedes-Benz W164 W204 W211 W212 W221 Petrol Lambda Sensor Probe A0045420818

Mercedes W164 W204 W211 W212 W221 Lambda Sensor A0045420818 is an original part from the Lambda Sensors and O2 Sensors group, designed for gasoline engines in select Mercedes models. A used sensor ensures a factory fit while economically restoring proper fuel system and emissions control operation.

Specifications and technical data

• SKU: A0045420818
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0045420818
• Substitutable numbers: A0045420818, A 0045420818, A 004 542 08 18, ŁS
• Fuel type: Petrol
• Category: Oxygen Sensors

Application and Function in Gasoline Systems

A lambda sensor in a gasoline engine is responsible for precisely measuring oxygen content in exhaust gases and transmitting the signal to the engine control unit (ECU). Based on this, the ECU adjusts the fuel dose, maintaining the mixture within the optimal range, which contributes to stable engine operation, smooth idling, and reduced fuel consumption.

For Mercedes W164, W204, W211, W212, and W221 models, using the correct O2 sensor is crucial for the proper functioning of the injection system, catalytic converter, and onboard diagnostic (OBD) systems. Using a part from the same family as the original ensures electrical and signal characteristics match the ECU's requirements.

Benefits of Using an Original Lambda Sensor

Using an original lambda sensor in a gasoline engine offers several practical operational benefits:

• maintaining the correct fuel-air mixture composition across a wide range of loads,
• more stable engine operation during startup and at idle,
• reduced risk of emission system error lights illuminating,
• better compatibility with the factory catalytic converter and O2 diagnostic system.

By maintaining parameters consistent with manufacturer requirements, the O2 sensor helps avoid issues with mixture adaptation, excessive enrichment, or leaning, which can lead to accelerated wear of exhaust system components.

Product Characteristics and Fitment

The offered lambda sensor belongs to the group of components intended for gasoline engines, which is important when selecting parts for diesel units. The design and connector type are engineered for specific Mercedes engine configurations, facilitating installation without the need for wiring modifications.

This product is sourced from a dismantled vehicle and is offered as a used original part, which means it retains the factory geometry, cable length, and operating characteristics, while reducing repair costs compared to a new part.

Professional Selection by Numbers and Compatibility

When selecting a lambda sensor for a Mercedes, it is crucial to match by OEM number and interchangeable numbers, as well as consider the fuel type and body generation. Proper matching eliminates problems with ECU errors, incorrect signal voltage, or slow sensor response.

To better understand the principles of selecting used sensors and modules, it is worth consulting the guide: Used Automotive Electronics Onboard – Why Choose Second-Hand ECUs and Sensors?, which discusses VIN/OEM selection, compatibility issues, and practical application examples.

Expanding Exhaust Gas Measurement Systems in Mercedes

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

For S-Class owners interested in the broader context of technical solutions development across generations, the article Evolution of the Mercedes S-Class: From W140 to W222 – Innovations, Model Differences, and Mercedes Auto Parts Over the Years may be helpful, as it organizes information about structural changes and the specifics of parts used in these models.