Subaru Engine Knock Sensor - 1AEKS00001

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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 testing.

Parts cannot be returned after they have been installed. Contact us with any questions before installing the parts.

Item Condition: New

Attention California Customers:

WARNING: Cancer and Reproductive Harm -

Lifetime Warranty

This item is backed by our limited lifetime warranty. In the event this item should fail due to manufacturing defects during intended use, we will replace the part free of charge.

5.00/ 5.0
6 reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Exact fit
October 26, 2013
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
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 Oreilly).
August 29, 2017
Part fit perfectly
Exactly what I was looking for bolted into place engine light is off all is well
November 16, 2017
What I liked about this company,it was very self explanatory to order on line. I was also pleased on how part was shipped to me in a reasonably timely matter and it was well packaged and was not broken. I would recommend this company to all my friends and family, thank you for a job well done.
December 2, 2018
Exact Fit
As always with 1AAuto, you get the exact part you need and an exact fit. Prices are always good. You can count on 1AAuto for your auto parts needs.
July 19, 2019
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Year Make Model Description
1999-2002Subaru Forester Subaru Forester H4 2.5L Engine Knock Sensor
1999-2002Subaru Impreza Subaru Impreza H4 2.5L Engine Knock Sensor
1999-2002Subaru Impreza Subaru Impreza H4 2.2L Engine Knock Sensor
1999-2002Subaru Impreza Subaru Impreza Outback H4 2.5L Engine Knock Sensor
1999-2001Subaru Legacy Subaru Legacy H4 2.5L Engine Knock Sensor
2000-2001Subaru Outback Subaru Outback H4 2.5L Engine Knock Sensor
Part 1AEKS00001
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