Mercedes W205 Diesel OM651 EGT Exhaust Gas Temperature Sensor A0009059004

Mercedes W205 Diesel OM651 EGT Exhaust Gas Temperature Sensor is a precision exhaust system component responsible for the accurate measurement of exhaust gas temperatures before and/or after exhaust aftertreatment elements. As part of the Lambda sensors and O2 sensors group, it works with the engine electronics, enabling proper regulation of the combustion process and protection of exhaust components. This used OEM component is a sensible choice for professional repair or diagnostics of the OM651 diesel unit in the W205 body.

Specifications and technical data

• SKU: A0009059004
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0009059004
• Substitutable numbers: A0009059004, A 000 905 90 04
• Fuel type: Diesel
• Category: Oxygen Sensors

Function and application in the Mercedes W205 with OM651 diesel engine

The Mercedes W205 Diesel OM651 EGT Exhaust Gas Temperature Sensor monitors thermal conditions in the exhaust system, transmitting a signal to the engine control unit. Based on this data, the ECU can appropriately control fuel dosage, turbocharger operation, and regeneration strategies for exhaust aftertreatment elements. A stable temperature reading is crucial for maintaining engine efficiency, reducing the risk of overheating, and maintaining correct emission parameters.

In practice, a functional EGT sensor helps to:

• maintain a safe temperature in the manifold and further sections of the exhaust system,
• prevent damage to components exposed to high temperatures,
• limit power drops resulting from incorrect temperature readings,
• maintain stable operation of the OM651 diesel engine under various load conditions.

Benefits of using an original EGT sensor

In the case of exhaust gas temperature sensors, measurement accuracy, resistance to high temperatures, and proper cooperation with the factory engine controller are crucial. The original component designed for the Mercedes W205 with the OM651 diesel engine ensures:

• correct signal characteristics consistent with ECU maps,
• stable operation across the full range of exhaust system operating temperatures,
• reduced risk of diagnostic errors related to exhaust gas temperature,
• better repeatability of readings compared to many aftermarket replacements.

Thanks to this, the EGT sensor is a safe service solution when replacing a damaged component in the Mercedes W205 exhaust system, without the need for modifications to the installation or software.

Product characteristics and condition

The presented EGT exhaust gas temperature sensor belongs to the Lambda sensors and O2 sensors group, which are measuring elements responsible for transmitting key information to the engine controller. The product comes from a Mercedes vehicle and is offered as a used part, which allows for economical repair while maintaining the original design specifications. A used component of this type is often chosen in professional workshops when compliance with the factory system and predictable operational behavior are important.

Due to the nature of operation at high temperatures, replacing the EGT sensor is recommended in the event of errors related to exhaust gas temperature, problems with the regeneration of exhaust aftertreatment elements, or noticeable drops in performance. A properly selected and functional sensor helps restore the correct operating parameters of the OM651 diesel unit in the W205 body.

Selection, compatibility, and technical support

To properly select an exhaust gas temperature sensor for a specific configuration of the Mercedes W205 with the OM651 diesel engine, it is worth using the OEM number and interchangeable numbers, as well as vehicle data (VIN, year of production, engine version). This allows you to avoid problems with cable length, connector type, or signal characteristics. In case of doubt, a good solution is to compare the removed element with the offered sensor in terms of design and plug type.

If you want to better understand how to safely use used modules and sensors in modern cars, including how to select them by OEM number, check hardware and software compatibility, and what to pay attention to during installation, read the guide: Used automotive electronics on board – why is it worth choosing second-hand ECU modules and sensors?

Related items from the same group

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, measuring probes, or exhaust system control elements, check the available parts in the Lambda sensors and O2 sensors Mercedes category.