wrx 52 plate

[john c]

hi does any1 know wot a knock sensor is?
is it easy to change and where does it go thanks

[2002pete]

The knock sensor is located on the block under the intake manifold.

Link: http://bbs.subaru-impreza.org/showthread.php?t=28428

[john c]

hi mate do u know wot it is for by any chance?

[john c]

thanks for all the diagrams u sent

[rikimaru]

Knock sensor is there primarily to prevent detonation. If it senses detonation it should then retard ignition timing accordingly.

[john c]

thanks mate, is it important that i change it then?

[rikimaru]

If it's gone then yes. in the short term it will certainly effect performance and economy if you're suffering detonation, but in the longer term it could cause damage to the engine itself.