Motorad 1KS1021 Ignition Knock (Detonation) Sensor
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Motorad

Motorad 1KS1021 Ignition Knock (Detonation) Sensor

Brand Motorad 1KS1021
Fits Subaru · 11 vehicles

Accurate knock sensing. Responds to a wide range of knock frequencies for precise engine condition feedback.

Durable piezoceramic element. Manufactured to tight tolerances for long-lasting performance.

OEM-spec design. Meets or exceeds OEM specifications from MotoRad.

Cross-references Motorad 1KS1021, 22060AA061 and 2131826 for the same application. See all 4.

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Ignition Knock Sensor for Subaru Applications

The MotoRad 1KS1021 ignition knock sensor monitors engine knock frequencies and sends accurate signal data to the ECM for ignition timing control. It is a direct-fit emission control sensor for select Subaru Legacy, Forester, and Impreza applications.

  • Part number: 1KS1021
  • Measures a wide range of knock frequencies for precise engine signal input
  • Piezoceramic sensing element built to tight manufacturing tolerances
  • Designed to meet or exceed OEM specifications
  • Manufactured in ISO TS16949 facilities
  • Compatible with Subaru Legacy, Forester, and Impreza fitments listed below

Detailed Product Overview

MotoRad 1KS1021 is an ignition knock sensor used in emission control and engine management systems to help the ECM detect detonation and adjust ignition timing. This sensor is a fitment-based replacement for 1996-1999 Subaru Legacy, 1998 Subaru Forester, and 1996-1998 Subaru Impreza applications, including 1996 Subaru Impreza from 07/1996. This part cross-references 22060AA061 and 2131826 for the same application.

What This Sensor Helps Address

  • Knock sensor fault codes
  • Erratic ignition timing caused by inaccurate knock signal input
  • Engine pinging or detonation-related drivability concerns
  • Check engine light conditions tied to knock sensor failure
  • Reduced ECM ability to manage spark timing under load

Installation Notes and Tips

Verify the connector style, mounting location, and engine application against the vehicle service information before installation. For Subaru Legacy, Forester, and Impreza models, confirm the exact year and note details, including the 1996 Impreza from 07/1996 application, to ensure correct fitment. Clear diagnostic trouble codes after installation and confirm proper sensor signal operation with a scan tool.

Quality Assurance

MotoRad designs this knock sensor to meet or exceed OEM specifications and manufactures it in ISO TS16949 facilities for controlled production quality and durability.

Related reading

This part fits 11 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelLitersCylindersNotes
1999SubaruLegacy2.2LH4—
1998SubaruForester2.5LH4—
1998SubaruImpreza2.5LH4—
1998SubaruImpreza2.2LH4—
1998SubaruLegacy2.5LH4—
1998SubaruLegacy2.2LH4—
1997SubaruImpreza2.2LH4—
1997SubaruImpreza1.8LH4—
1997SubaruLegacy2.5LH4—
1997SubaruLegacy2.2LH4—
1996SubaruImpreza2.2LH4From 07/1996
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Motorad — 1KS102122060AA061213182689052894