Bosch 030-905-377 D Ignition Knock Sensor

The Bosch 030-905-377 D is a precision-engineered ignition knock sensor designed to detect and prevent engine knock or detonation in modern automotive engines. This OE-quality sensor plays a critical role in protecting your engine from damage while optimizing performance, fuel efficiency, and emissions control.

How It Works:

This knock sensor utilizes a piezoelectric element that detects high-frequency engine vibrations characteristic of knocking or pinging. When abnormal combustion occurs, the sensor converts these vibrations into electrical signals and transmits them to the Engine Control Unit (ECU). The ECU then adjusts ignition timing in real-time to eliminate the knock and prevent potential engine damage.

Key Features:

• Genuine Bosch OE-quality construction for reliable performance
• Piezoelectric design provides accurate knock detection
• Helps optimize ignition timing for improved fuel efficiency
• Prevents engine damage from detonation and abnormal combustion
• Reduces emissions through proper combustion control
• Direct replacement for multiple Audi, Volkswagen, Porsche, and other European applications

Technical Information:

This sensor does not include mounting hardware or wiring harness—sensor only. Bosch part number 0-261-231-146 is the manufacturer's designation for this component. Cross-reference OEM part numbers include 030-905-377-C (previous revision), and various manufacturer-specific numbers for Audi, VW, Seat, Skoda, Porsche, Ford, MAN, Bentley, and Cupra applications.

Application Notes:

Compatible with a wide range of European vehicles including select Audi (A3, A4, TT, Q7), Volkswagen (Golf, Jetta, Beetle, Passat, Atlas, Touareg, R32), Porsche, and other makes. This sensor is typically mounted on the engine block or cylinder head between cylinders for optimal vibration detection.