Ignition Knock Sensor Connector for Subaru

Standard Ignition S2540 is a weather-sealed ignition knock sensor connector built for Subaru applications that need a secure electrical connection at the detonation sensor. It is a rectangular, 2-connector harness with blade terminals and 18-gauge wiring for a direct-fit style repair.

Compatible with 1999-2002 Subaru Forester, 1999-2002 Subaru Impreza, 1999-2001 Subaru Legacy, and 2000-2001 Subaru Outback, this Standard Ignition S2540 connector supports clean signal transfer in knock sensor circuits.

• Part number: S2540
• Ignition knock (detonation) sensor connector
• Rectangular connector shape with female + male connector gender
• Weatherproof sealed design
• 18-gauge wire construction with 160 mm harness length
• Blade terminal type with 3 terminals
• Housing length: 1 1/2 in.

Detailed Product Overview

Standard Ignition S2540 is designed for Subaru knock sensor wiring repairs where the original connector is damaged, brittle, or no longer making consistent contact. The 2-connector layout, 3 blade terminals, and sealed housing help maintain a stable electrical interface in the emission control circuit. This part cross-references PT2525 and EC2451 for the same application.

Use S2540 when servicing Subaru Forester, Impreza, Legacy, or Outback models from the listed years and you need a replacement connector that matches the original harness style and terminal configuration.

Common Problems This Part Can Address

• Broken or cracked knock sensor connector housing
• Intermittent detonation sensor signal
• Corroded or loose terminal contact
• Damaged wiring near the sensor connector
• Check engine light concerns related to knock sensor circuit faults

Installation Notes and Tips

Verify connector shape, terminal style, and harness length before installation. Match the existing Subaru knock sensor connector layout and inspect the mating terminals for corrosion or heat damage before connecting the new harness. Confirm proper pin alignment and secure the sealed connection fully to maintain circuit integrity.

Quality Assurance

Standard Ignition is a recognized aftermarket source for electrical and emission control components. S2540 is built to meet the fitment and connector specifications listed for the supported Subaru applications.