Mercedes W204 W212 M276 Petrol Engine Crankcase Knock Sensor A2769050300

Mercedes W204 W212 M276 Petrol Engine Crankcase Knock Sensor is a precision component of the petrol engine control system, responsible for reliably monitoring knocking combustion. A properly selected and functional sensor allows the M276 unit to operate under stable conditions, supporting optimal performance and safe crankshaft loading. This solution is intended for users who expect technically correct engine operation and repeatable parameters in daily use.

Specifications and technical data

• SKU: A2769050300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2769050300
• Substitutable numbers: A2769050300, A 276 905 03 00
• Fuel type: Petrol
• Category: Crankshafts

Function and role of the knock sensor in the M276 engine

The knock sensor in the M276 petrol engine is responsible for recording vibrations characteristic of knocking combustion within the engine block and the Crankshaft zone. The signal from the sensor is analyzed by the ECU, which adjusts the ignition timing based on this data, protecting mechanical components from excessive loads. Thanks to this, the ignition system can operate within a range that ensures good dynamics while limiting the risk of mechanical damage.

In petrol engines such as the M276, a properly functioning knock sensor has a direct impact on:

• engine operation stability across the entire RPM range,
• protection of the crankshaft and cooperating components against overloads,
• maintaining appropriate combustion parameters under various load conditions.

Purpose and compatibility in the Mercedes range

The presented sensor is dedicated to the M276 unit used in Mercedes W204 and Mercedes W212 models, ensuring proper geometric and electrical fitment to the factory installation. Using an original solution from this group allows for consistency with the factory engine operating characteristics, without the need for modifying the wiring harness or mounts. This is particularly important when servicing petrol units, where correct interpretation of the sensor signal is crucial for the ignition control strategy.

The component comes from the Mercedes brand offer, which facilitates integration with the existing control system and minimizes the risk of software compatibility issues with the engine control unit.

Benefits of using an original knock sensor

Using a dedicated knock sensor in the M276 petrol engine translates into a number of practical operational benefits. The most important include:

• maintaining the factory operating characteristics of the engine,
• proper mechanical protection of components in the crankshaft area,
• stable ignition parameters under a wide range of loads,
• reducing the risk of errors related to incorrect knock combustion readings.

For users who expect predictable vehicle behavior and repeatable performance, choosing such a component is a practical and technically justified solution.

Condition, verification, and service application

The offered knock sensor is a secondary market component, making it an attractive option when servicing M276 units in Mercedes W204 and W212 vehicles. This type of component is particularly useful for:

• diagnosing faults related to knock combustion errors,
• repairs in the area of the engine block and crankshaft,
• comprehensive maintenance of the petrol engine control system.

Selecting a sensor that complies with the requirements of the M276 unit allows for maintaining consistent engine operating parameters after repairs or upgrades.

Related components and additional technical information

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 shafts, journals, or components cooperating with the crankshaft system, check the available parts in the Mercedes Crankshafts category.

For drivers interested in a broader context of operation and typical problems of engines in other brands, the guide regarding faulty BMW E90 engines may be helpful – you can find it in the article Faulty BMW E90 engines: check what can ruin your budget, which shows how proper selection and maintenance of components affects long-term vehicle ownership costs.