Mercedes W203 W204 W212 M271 Petrol Engine Crankcase Knock Sensor A0061533628

The Mercedes W203 W204 M271 Knock Sensor is an original component of the gasoline engine control system, responsible for precisely detecting knock combustion in M271 series engines. Thanks to its factory design, the sensor works with the engine electronics in a stable, repeatable, and safe manner, supporting the correct operation of the crankshaft and protecting the engine unit from damage.

Specifications and technical data

• SKU: A0061533628
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0061533628
• Substitutable numbers: A0061533628, A 006 153 36 28, KD
• Fuel type: Petrol
• Category: Crankshafts

Purpose and Role in the Engine System

The knock sensor in the M271 engine monitors vibrations transmitted through the block and crankshaft, allowing the ignition controller to make real-time adjustments to the ignition timing. In gasoline engines, this is crucial for:

• protecting pistons, bearings, and the crankshaft from mechanical overload,
• maintaining stable engine operation across the full load range,
• reducing the risk of detonation combustion during dynamic driving.

A properly functioning knock sensor translates to smoother engine operation, improved running refinement, and predictable throttle response.

Benefits of Using an Original Mercedes Sensor

For components monitoring crankshaft and ignition operation, compliance with factory parameters is paramount. Using a sensor dedicated to M271 units ensures:

• correct sensitivity characteristics within the vibration frequency range typical for this engine,
• consistency with the engine controller algorithms used by the manufacturer,
• adherence to factory-set knock protection strategies.

This allows the control system to fully utilize its capabilities, and the gasoline engine maintains stable operating parameters over a long service life.

Component Condition and Application in Service Practice

The offered sensor comes from the crankshafts category, highlighting its close connection to monitoring mechanical loads within the lower part of the engine. A used element is a good choice in situations where:

• errors related to knock combustion or incorrect ignition operation occur,
• diagnostics indicate signal interference from the sensor,
• an economical repair that is still compliant with factory specifications is necessary.

Choosing an original, used component allows for maintaining the factory control logic without the risk of characteristic mismatch, which is common with random aftermarket replacements.

Why Choose an OEM Component for the Drivetrain

Components monitoring crankshaft operation, knock sensors, and other drivetrain components should maintain the parameters specified by the manufacturer. In many cases, a used OEM part is a better choice than an inexpensive aftermarket replacement with uncertain characteristics. If you want to learn more about the arguments for such a repair strategy, check out the article: Whining differential? Why a used OEM drive axle is a sensible alternative to aftermarket parts.

Other Mercedes Crankshafts – Selecting Parts for Specific Engines

If you are also looking for other components from the Mercedes crankshafts category, matched to specific engines from this brand, check out the available assortment: Mercedes crankshafts. This will make it easier to assemble a cohesive set of components for repairing or upgrading the crankshaft-piston system in your car.