Walker 242-1038 Ignition Knock (Detonation) Sensor

Walker 242-1038 Knock Sensor Overview

Walker Products 242-1038 is an ignition knock sensor built for Subaru applications that need accurate detonation detection and stable engine management input. It is a direct-fit style replacement for select 1999-2002 Subaru Forester, Impreza, Legacy, and 2000-2001 Subaru Outback models.

Walker Products has supplied fuel system and engine sensor components since 1946, with manufacturing and engineering support focused on OEM-level specifications. The Walker Products line includes engine management parts such as cam and crank sensors, throttle position sensors, oxygen sensors, and fuel system repair components.

Key Features

• Ignition knock (detonation) sensor for engine timing feedback
• Wiring harness included for installation on the vehicle side connection
• Female connector with oblong shape
• Blade terminal design with 1 terminal and 1 connector
• Wiring harness length: 95.2500
• Walker Products part number 242-1038

Detailed Description

This Walker knock sensor is engineered for Subaru engine management systems that rely on knock detection to help the ECU adjust ignition timing. It is a fitment-based replacement for 1999-2002 Subaru Forester, 1999-2002 Subaru Impreza, 1999-2001 Subaru Legacy, and 2000-2001 Subaru Outback. If you are searching for a Subaru Forester knock sensor replacement, Subaru Impreza knock sensor, or Subaru Legacy detonation sensor, 242-1038 is the cataloged application.

Walker Products manufactures engine sensors and fuel system components to meet or exceed OEM standards and specifications, with ISO 9001/IATF16949 certified production practices. This part cross-references Bosch 0986JG0835 for the same application.

Common Issues This Part May Address

• Knock sensor fault codes related to detonation signal loss
• Erratic ignition timing caused by a failing sensor signal
• Reduced engine performance from inaccurate knock feedback
• Check engine light concerns tied to knock sensor circuit problems
• Driveability issues on Subaru Forester, Impreza, Legacy, or Outback models

Installation Notes and Tips

Verify connector shape, terminal style, and harness routing before installation. The sensor uses a female connector, blade terminal, and included wiring harness, so confirm the vehicle-side connection matches the original layout. Always inspect the mounting location and surrounding wiring for heat damage, corrosion, or abrasion before replacing the sensor.

Quality Assurance

Walker Products backs its engine sensor program with in-house manufacturing, product management, engineering support, and technical documentation. The company states that its parts are produced to meet or exceed OEM standards and specifications, and its facilities are certified to ISO 9001/IATF16949 quality systems.