Genuine Mercedes 278 905 00 00 Knock Sensor OEM Engine Detonation Sensor

The Genuine Mercedes-Benz 278 905 00 00 is an OEM knock sensor designed to factory specifications for Mercedes-Benz vehicles equipped with the M278 V8 biturbo engine. As a direct-fit Original Equipment Manufacturer (OEM) component, this sensor ensures seamless integration with the engine management system without modification.

The knock sensor monitors the engine block for abnormal combustion events—commonly known as engine knock or detonation—and relays precise electrical signals to the engine control unit (ECU). The ECU uses this data to dynamically adjust ignition timing, protecting the engine from damage and maintaining optimal performance and fuel efficiency.

Key Features:

• 100% Genuine Mercedes-Benz OEM part — not aftermarket or remanufactured
• Manufactured to exact factory specifications for precise fit and function
• Monitors combustion knock and detonation for real-time ignition timing correction
• Helps protect engine internals from damage caused by pre-ignition or detonation
• Plug-and-play installation — direct replacement for the original sensor
• Ensures compatibility with Mercedes-Benz ECU and engine management systems

Choosing a Genuine Mercedes-Benz knock sensor over an aftermarket alternative guarantees the signal accuracy and durability that the M278 engine's sophisticated engine management system requires. Part number 278 905 00 00 is also commonly referenced as 2789050000.