Lambda Probe Mercedes W204 W205 W213 M278 Petrol Oxygen Sensor A0075426418

Mercedes W204 W205 W213 M278 Lambda Sensor A0075426418 is an original part from the Lambda Sensors and O2 Sensors category, designed for gasoline engines in Mercedes vehicles. A used OEM part helps maintain the original operating parameters of the powertrain, ensuring stable mixture composition control and proper interaction with the engine management system.

Specifications and technical data

• SKU: A0075426418
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0075426418
• Substitutable numbers: A0075426418, A 007 542 64 18
• Fuel type: Petrol
• Category: Oxygen Sensors

Lambda Sensor Purpose and Function

In a gasoline engine, the lambda sensor measures the oxygen content in the exhaust gases and sends a precise signal to the engine control unit (ECU). Based on this, the ECU adjusts the fuel dosage, which affects:

• stable engine operation across the full load range,
• maintenance of the correct fuel-air mixture composition,
• efficient catalytic converter operation and reduced exhaust emissions,
• lower fuel consumption while maintaining adequate dynamics.

In Mercedes C-Class and E-Class vehicles with the M278 engine, a properly functioning lambda sensor is crucial for the correct operation of the injection system and for avoiding errors stored in the control unit's memory.

Benefits of Using an Original Mercedes Lambda Sensor

Using an original lambda sensor specifically designed for Mercedes W204, W205, and W213 models with gasoline engines ensures proper electrical and mechanical fitment. This translates to:

• correct signal characteristics for the engine control unit,
• appropriate cable length and connector type,
• trouble-free installation in the factory exhaust system socket,
• compliance with the ECU software intended by the manufacturer.

This reduces the risk of problems typical with aftermarket alternatives, such as unstable idling, increased fuel consumption, or intermittent diagnostic errors.

Condition, Origin, and Application in Gasoline Engines

The offered lambda sensor is a used part from a dismantled vehicle, allowing for economical repair while retaining an OEM component. It is designed for fuel systems of gasoline engines where precise mixture composition control is required across the entire operating range of the unit.

Lambda sensor replacement is particularly recommended in cases of:

• errors related to fuel trims or sensor efficiency appearing,
• uneven engine operation at idle,
• increased fuel consumption without other apparent causes,
• problems passing exhaust emission tests.

Selection by OEM Number and Interchangeable Numbers

The selection of this lambda sensor should be based on the OEM number and interchangeable numbers assigned to the specific reference. This allows for verification of compatibility with the particular M278 engine variant and specific body version. If in doubt, it is advisable to compare the markings with the currently installed part or use a parts catalog with the VIN.

If you are interested in other Mercedes Lambda Sensors and O2 Sensors, check availability in the dedicated category: Mercedes Lambda Sensors and O2 Sensors.

Technical Support and Additional Materials

When selecting used sensors and electronic components, a practical guide describing selection principles, compatibility verification, and installation can be helpful. Detailed information can be found in the article: Used Automotive Electronics – Why Choose Proven ECU Modules and Sensors.

If you want to expand your knowledge on safely purchasing used components online, it is also worth reading the material: Safe Online Purchase of Used Car Parts Step-by-Step, which discusses selection by OEM number, seller verification, and practical examples for workshops and individual users.