Mercedes-Benz W169 W203 W204 W211 W212 Petrol Lambda Sensor Probe A0045420718

The MERCEDES W169 W203 W204 W211 W212 Lambda Sensor is an original part from the lambda sensors and O2 sensors category, designed for gasoline engines of popular Mercedes models. A used, tested sensor allows for the restoration of proper fuel-air mixture control system operation, stabilization of combustion, and reduction of fuel consumption. It is a practical solution for users who expect factory fitment without the need to invest in a new part.

Specifications and technical data

• SKU: A0045420718
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0045420718
• Substitutable numbers: A0045420718, A 0045420718, A 004 542 07 18, ŁS
• Fuel type: Petrol
• Category: Oxygen Sensors

Application and Compatibility

The presented Mercedes lambda sensor is intended for selected versions of the W169, W203, W204, W211, and W212 models with gasoline engines. It is responsible for measuring oxygen content in exhaust gases and transmitting the signal to the engine control unit, enabling precise fuel dose correction.

To select the correct sensor for a specific body version and engine unit, it is recommended to verify by OEM number or vehicle VIN. This selection method minimizes the risk of incompatibility in thread, cable length, or connector type.

Technical Parameters and Role in the Exhaust System

The lambda sensor offered here operates in a gasoline system, where maintaining the correct mixture composition across a wide range of loads is crucial. A properly functioning O2 sensor:

• stabilizes engine operation at idle and under load,
• reduces excessive fuel consumption during city and highway driving,
• supports efficient catalytic converter operation, reducing harmful emissions,
• minimizes the risk of mixture-related errors in the engine control unit.

Thanks to its factory design, the sensor works with the original engine control unit, ensuring appropriate signal characteristics and warm-up time, which is particularly important in modern gasoline engines.

Condition, Verification, and Installation

The offered Mercedes lambda sensor and O2 sensor is a used part intended for reinstallation in a vehicle. A used component is a sensible choice when the current sensor generates errors, causes uneven engine operation, or increased fuel consumption.

Before installation, it is recommended to:

• check compatibility with the vehicle's electrical system,
• verify the thread in the manifold or exhaust pipe socket,
• use appropriate high-temperature mounting paste (without applying it to the measuring element),
• clear errors in the control unit after replacement and perform a test drive.

A correctly installed sensor allows for quick restoration of proper fuel corrections and stable engine operation.

Why Choose a Used Mercedes Lambda Sensor

Choosing an original, used O2 sensor is a compromise between cost and quality. Compared to inexpensive aftermarket alternatives, a factory sensor maintains its proper operating characteristics, which translates to better integration with the vehicle's electronics. This is particularly important in modern gasoline injection systems, where the engine control unit is sensitive to the signal parameters from the oxygen sensor.

If you want to learn more about how to safely use second-hand electronic components, check out our guide: used automotive electronics – why second-hand ECU modules and sensors make sense. You will find practical tips on selection by OEM number, compatibility, and installation.

Other Mercedes Lambda Sensors and O2 Sensors

If you are also looking for other Mercedes lambda sensors and O2 sensors for different models or engine configurations, check out our dedicated category: Mercedes lambda sensors and O2 sensors. Thanks to filters by brand and model, you can easily narrow down the results to items that fit your car.