Mercedes W204 C209 OM642 Gas Temperature Sensor A0071534828

Mercedes W204 C209 OM642 Gas Temperature Sensor is a precision component of the diesel engine control system, responsible for the accurate measurement of exhaust gas temperature. Thanks to reliable readings of the engine's operating parameters, the sensor supports the proper functioning of exhaust gas treatment systems and stable engine operation. This solution is designed for users who expect consistent cooperation with the OM642 diesel electronics and predictable operating parameters.

Specifications and technical data

• SKU: A0071534828
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0071534828
• Substitutable numbers: A0071534828, A 007 153 48 28
• Fuel type: Diesel
• Part type: Sensor
• Category: Temperature Sensors

Purpose and function in the exhaust system

The offered gas temperature sensor is a component from the Temperature sensors category, designed to work with the OM642 diesel engine used in Mercedes C-Class (W204) models and the C209 body style. Its task is to continuously measure the temperature of exhaust gases and transmit a signal to the engine control unit, which enables:

• monitoring the thermal load of the exhaust system,
• supporting injection and boost strategies in the diesel engine,
• maintaining stable engine operating parameters under various load conditions.

A properly functioning gas temperature sensor reduces the risk of overheating exhaust system components and helps maintain predictable vehicle performance.

Benefits of using an original Mercedes sensor

Choosing a sensor dedicated to a specific engine unit translates into correct signal characteristics and compatibility with the factory control unit software. In practice, this means:

• stable diesel engine operation without unwanted parameter fluctuations,
• reduced risk of errors related to exhaust gas temperature,
• better cooperation with systems responsible for exhaust emissions.

A component from this group is particularly important when operating in variable thermal conditions, where the accuracy of exhaust temperature measurement has a direct impact on the engine control strategy.

Product characteristics and condition

The presented Mercedes gas temperature sensor belongs to the group of used components, which allows for an economical replacement of the part while maintaining the functionality required in modern diesel units. This type of part is a good choice in a situation where the current sensor is generating errors, causing the engine to enter limp mode, or disrupting the operation of the exhaust system.

Due to the specific nature of working in a stream of hot exhaust gases, replacing a worn-out sensor with a functional unit allows for restoring correct temperature readings and reducing the risk of improper engine operation in the long term.

Selection and integration with the vehicle system

The sensor is designed for a diesel engine, so its characteristics have been adapted to operating conditions typical for diesel units – high exhaust temperatures and variable loads. When selecting the component, it is worth paying attention to:

• compatibility with the specific generation of the OM642 engine,
• proper fitment to the vehicle's electrical harness,
• mounting location in the exhaust system of the given model.

A properly selected gas temperature sensor facilitates diagnostics, helps avoid recurring errors in the control unit, and supports maintaining stable engine operating parameters in daily use.

Related components and technical knowledge

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional temperature sensors, intake system sensors, or measurement components in the exhaust system, check the available parts in the Mercedes Temperature sensors category.

When working with diesel units, it is also worth ensuring the efficiency of the cooling system, which has a direct impact on the engine's thermal conditions and indirectly on the exhaust temperature – you can find more practical information in the guide Summer heat vs. cooling system: used radiators and fans as a guarantee of savings, where the impact of high temperatures on engine operation and ways to reduce service costs are described.