Lambda Probe Mercedes C216 W204 W221 OM274 Catalytic Converter Lambda Sensor

Lambda Probe Mercedes C216 W204 W221 OM274 Catalytic Converter Lambda Sensor is an original component from the Lambda probes and O2 sensors group, designed for precise control of the air-fuel mixture in Mercedes engines. This used sensor from original production ensures stable engine operation, proper catalytic converter performance, and correct interaction with the OM274 engine control electronics.

Specifications and technical data

• SKU: A0085423018
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0085423018
• Substitutable numbers: A0009050701, A 000 905 07 01
• Category: Oxygen Sensors

Purpose and function of the lambda probe

The described lambda probe operates in the exhaust system near the catalytic converter, where it monitors oxygen content in the exhaust gases and transmits a signal to the engine control unit. This enables dynamic fuel dosage correction, which supports efficient combustion, lower fuel consumption, and reduced exhaust emissions. A properly functioning O2 sensor is crucial for stable idle speed, smooth acceleration, and protecting the catalytic converter from overheating.

Benefits of using an original Mercedes probe

The component comes from the Mercedes production line, which means it maintains factory electrical parameters and operating characteristics. In practice, this translates into:

• reliable air-fuel mixture readings across the full range of engine loads,
• proper compatibility with the factory OM274 engine control unit,
• reduced risk of ECU memory errors related to the lambda probe system,
• maintenance of factory performance and engine refinement in C216, W204, and W221 models.

Thanks to the original design of the wiring harness and connector, installation is generally straightforward for an experienced mechanic, and the component does not require any additional installation modifications once correctly fitted.

Condition of the component and operational aspects

The product is used, which allows for lower repair costs compared to a new part while maintaining the manufacturer's original specifications. Before installation, it is recommended to perform a standard check of the electrical system, exhaust system tightness, and clear any existing errors in the engine control unit to fully utilize the potential of the installed lambda probe.

Selection and integration with vehicle electronics

When selecting a lambda probe for a Mercedes, it is essential to match it to the specific engine version and exhaust system so that the sensor characteristics are compatible with the maps in the control unit. This model has been designed to work with the OM274 unit and the electrical architecture used in C216, W204, and W221 bodies, which facilitates integration with the factory diagnostic system and emission control system.

If you want to better understand when choosing a used electronic component makes sense and how to safely select such parts, it is worth reading our guide: The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?

Expanding the exhaust measurement system in a Mercedes

If you are planning a comprehensive repair or upgrade of the engine and exhaust area in your Mercedes and need other components from the same group, such as additional O2 sensors, pre- and post-catalytic converter probes, or exhaust gas monitoring components, check out the available parts in the Mercedes lambda probes and O2 sensors category.