This replacement Engine Knock (Detonation) Sensor is just what you need to get your Subaru in good running order again!

A knock sensor is like a small electronic microphone that is usually attached to the engine block and listens for a couple of things that a engine might do. One thing it listens for is pre-ignition or knocking inside the engine usually caused by a few issues including dirty gas, wrong engine timing low octane fuel, and also by the wrong spark plugs. It also listens for engine run on which happens when the vehicle is turned off, but tries to keep running until it stalls. Once a noise is detected, the knock sensor sends a signal to the cars computer which in turn will retard the timing at 2 degree intervals until it corrects the issue. If the knock sensor fails, it can seriously damage the engine, as continuous pre-ignition can cause fracture in the pistons.

This knock sensor features the following specifications:

  • 100% New not remanufactured
  • Built to strict quality control standards

This Engine Knock Sensor makes a great replacement and has substantial cost savings over a dealer unit.


Our electrical and electronic parts are subject to strict quality control testing.  Once the item has been installed or plugged in, it is no longer eligible for a refund.  The item may be eligible for replacement, only if it is found to have a manufacturing defect. Before purchasing, please ensure proper diagnosis of the failed original part is performed


Lifetime Warranty

This item is backed by a Limited Lifetime Warranty. In the event this item should fail due to manufacturing defects during intended use, we will exchange the part free of charge (excludes shipping charges) for the original purchaser.

5.0 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
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1 Star
Part fit perfectly
Exactly what I was looking for bolted into place engine light is off all is well
November 16, 2017
8 months ago
Perfect Replacement
Worked great in my 2001 Subaru Outback. The part appears identical to the OEM sensor and cleared my P0328 CEL code (knock sensor voltage). The car runs much more smoothly now because the timing is not being pulled and the gas mileage has nearly doubled.

Easy swap with a 6" ratchet extension (borrowed from O'reilly).
August 29, 2017
10 months ago
Did the Trick
Had a knock sensor error code on my 2000 Forester. Easily replaced (using a 1/2" drive ratchet, six inch extender, wobble socket and 12mm socket). No more code.
November 20, 2016
Exact fit
October 26, 2013
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Vehicle Fit

  • 1999-2002 Subaru Forester Engine Knock Sensor H4 2.5L
  • 1999-2002 Subaru Impreza Engine Knock Sensor H4 2.5L
  • 1999-2002 Subaru Impreza Engine Knock Sensor H4 2.2L
  • 1999-2002 Subaru Impreza Outback Engine Knock Sensor H4 2.5L
  • 1999-2001 Subaru Legacy Engine Knock Sensor H4 2.5L
  • 2000-2001 Subaru Outback Engine Knock Sensor H4 2.5L

This part replaces:

  • OE # 22060 AA070
  • Standard Motor Products KS98
Part #: 1AEKS00001