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PAC905377A/1
Product Information
Product Information
Knock Sensor.

The BOSCH Knock Sensor is a vital engine management sensor designed to detect abnormal combustion events, commonly known as engine knock or detonation. Mounted directly to the engine block, the sensor continuously monitors engine vibrations and sends real-time data to the engine control unit (ECU).
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Diagram Ref No 10

When knock is detected, the ECU can instantly adjust ignition timing and other engine parameters to protect the engine from damage while maintaining optimal performance. The BOSCH knock sensor provides accurate detection, reliable communication with the ECU, and long-term durability in demanding engine environments.

What This Product Does:

  • Monitors engine vibrations for signs of knock or detonation
  • Sends real-time data to the engine control unit (ECU)
  • Allows the ECU to adjust ignition timing when necessary
  • Helps optimise engine performance and efficiency
  • Protects internal engine components from combustion-related damage
  • Supports smooth engine operation under varying loads and conditions

Symptoms Of Wear Or Failure:
  • Check engine light illumination
  • Engine knock or pinging noises under acceleration
  • Reduced engine performance and power output
  • Poor fuel economy
  • Engine hesitation or sluggish throttle response
  • Incorrect ignition timing adjustments
  • Increased emissions Knock sensor-related fault codes stored in the ECU

Why Replacement Matters:
  • Restores accurate detection of engine knock and detonation
  • Allows proper ignition timing adjustment by the ECU
  • Helps maximise engine performance and fuel efficiency
  • Protects pistons, valves, and other internal engine components from damage
  • Reduces the risk of long-term engine wear caused by uncontrolled detonation
  • Maintains emissions compliance and engine efficiency
  • Prevents unnecessary engine management faults and warning lights
  • Ensures reliable communication between the engine and ECU for optimum operation



Related reference numbers
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PAC905377A
PAC905377A

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