Knock sensor VOLVO S80 2004

OEM: 31104959

Disassembled car photo

Engine running

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What is this part and why does it matter?

The knock sensor detects abnormal combustion vibrations (engine knock/pinging), letting the ECU retard ignition timing to prevent engine damage.

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Signs of a faulty part

If you notice any of the following, the part likely needs replacement:

  • Reduced power or performance, especially under load
  • Check Engine light with a knock sensor fault code
  • Audible pinging or knocking noise from the engine (if the ECU hasn’t fully compensated)

Installation information

Screws into the engine block — torque to the specified value, as incorrect torque can affect the sensor’s vibration sensitivity.

Donor vehicle description

VIN
YV1TS61S941382781
Make, model
VOLVO S80
Year
2004
Engine
Petrol, 2.4L 125K B5244S, 3451796
Transmission
Automatic, 5-AUT / AW55-50/51SN, 4CV572726
Drive
Front
Equipment
LHD
Colour
BLACK SAPPHIRE METALLIC 45200

203 parts from this car

  • Decorative engine cover VOLVO S80 2004
  • Lower instrument panel trim VOLVO S80 2004
  • Decorative part of the engine cover VOLVO S80 2004
  • Air conditioner dryer VOLVO S80 2004
  • Exhaust manifold VOLVO S80 2004
  • Solenoid vacuum valve VOLVO S80 2004
  • Solenoid vacuum valve VOLVO S80 2004
  • Antenna amplifier unit VOLVO S80 2004
  • Brake booster master cylinder VOLVO S80 2004
  • Coolant reservoir VOLVO S80 2004
  • Power steering reservoir VOLVO S80 2004
  • Solenoid vacuum valve VOLVO S80 2004

Frequently asked questions

Without reliable knock detection, the ECU defaults to a conservative, retarded ignition timing to protect the engine from potential damage, which reduces power and efficiency as a safety precaution.

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