Mercedes C117 W246 X156 Diesel DPF Exhaust Gas Temperature Sensor OM651

Mercedes C117 W246 X156 Diesel DPF Exhaust Gas Temperature Sensor OM651 is a precise exhaust system component responsible for monitoring exhaust gas temperature in diesel engines. Thanks to accurate measurement of the powertrain unit's operating parameters, it supports the correct functioning of the DPF filter and injection strategies. This solution is designed for users who expect stable engine operation, proper particulate filter regeneration, and reduced risk of accessory failures.

Specifications and technical data

• SKU: A0009058105
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0009058105
• Substitutable numbers: A0009058105, A 000 905 81 05
• Fuel type: Diesel
• Category: Oxygen Sensors

Purpose and Function of the Exhaust Gas Temperature Sensor

The offered exhaust gas temperature sensor is compatible with the OM651 engine in Mercedes vehicles with C117, W246, and X156 body types powered by diesel fuel. Its task is to continuously measure the temperature of exhaust gases near the DPF filter, enabling the engine control unit to precisely manage the soot combustion process and protect exhaust system components from overheating.

A correctly functioning exhaust gas temperature sensor contributes to:

• stable engine operation across the full load range,
• proper regeneration of the DPF particulate filter,
• reduced risk of filter clogging and power loss,
• exhaust emission control in accordance with manufacturer specifications.

Category: Lambda Sensors and O2 Sensors

This component belongs to the Lambda Sensors and O2 Sensors category, which includes components responsible for monitoring exhaust parameters and transmitting key data to the engine control unit. For diesel engines, the role of the temperature sensor is particularly crucial for the thermal safety of the exhaust system and the effectiveness of exhaust gas purification systems.

Choosing the correct sensor from this category helps to minimize the occurrence of control unit errors, limp mode, and incorrect temperature readings, which can lead to unnecessary diagnostic and repair costs.

Benefits of Using an Original Mercedes Sensor

Using a sensor dedicated to a specific engine family and body type ensures:

• full integration with the factory ECU software – correct measurement characteristics and no need for installation modifications,
• appropriate thread and cable length matching for the specific model's exhaust system,
• stable measurement signals, which translates to predictable vehicle behavior in urban and highway driving.

For diesel engines with a DPF filter, a correctly selected exhaust gas temperature sensor is one of the key elements influencing the lifespan of the filter, turbocharger, and other exhaust system components.

Selection, Installation, and Diagnostics

Before installation, it is recommended to verify the part's compatibility with the specific vehicle version, preferably based on the vehicle's identification data or service documentation. Proper sensor selection minimizes the risk of issues with the thread, cable length, or electrical connector type. When replacing, pay attention to:

• the condition of the exhaust system port and any contaminants,
• proper cable routing, away from sharp edges and excessive heat radiation,
• secure connection of the plug, without looseness or strain.

After installation, computer diagnostics are recommended to clear any potential errors and check current exhaust gas temperature readings in live data parameters.

If you are planning exhaust system service for your Mercedes and need other measurement elements dedicated to this brand, check the available parts in the Mercedes Lambda Sensors and O2 Sensors category.

Used Electronics and Sensors – How to Buy Wisely

For exhaust gas temperature sensors and other engine electronics, it is advisable to pay attention to correct selection based on manufacturer markings and compatibility with the control unit software. It is good practice to use guides describing the principles of selecting, installing, and diagnosing used modules and sensors.

To better understand how to safely choose used electronic components and what to look for during their installation, consult the guide: Used Automotive Electronics Onboard – Why Choose Second-Hand ECUs and Sensors?