The Walker Products Ignition Knock (Detonation) Sensor (part number 242-1037) is a direct-fit replacement for 1997-1999 Subaru vehicles with 2.5L, 2.2L, and 1.8L engines. Walker Products Knock Sensors are OE Replacement components that detect engine detonation to help the ECU adjust timing and prevent internal engine damage.
Features:
- OE Replacement Sensitivity:Â Calibrated to match factory frequency response and output for seamless ECU integration and spark control.
- Exact OE Fit: Installs directly into original mounting locations using factory connectors and threads—no modifications required.
- Built for Harsh Environments:Â Engineered to resist heat, vibration, and oil exposure for long-lasting signal reliability.
- Detects Engine Knock:Â Monitors vibration frequencies to detect detonation and prevent pre-ignition engine damage.
- Restores Ignition Timing Accuracy:Â Supports optimal fuel efficiency, performance, and emissions by correcting spark advance during knock conditions.
Specifications:
| Number of Terminals | 1 |
| Connector Type | Blade |
| Connector Shape | Oblong |
| Connector Gender | Male |
| Terminal Gender | Female |
Fits: 1997-1999 Subaru models including Forester, Impreza, and Legacy — 2.5L, 2.2L, and 1.8L engines.
Confirm the year, make, model, and engine against your vehicle before ordering. Full application data is shown in the fitment lookup on this page.
Interchanges With: Forecast KS39, Hoffer Products 7517614, Fispa 83.517, NTK ID0199, ERA 550621, Werner Metzger GmbH 0907099, FAE 60246, Standard Import 70040 and 15 more
WARNING: This product can expose you to chemicals, including lead, which is known to the State of California to cause cancer or birth defects or other reproductive harm.
