Subaru OEM Engine Harness (15 STI) | 24020AF990

Overview

The Genuine Subaru OEM Engine Harness (Part #24020AF990) is the factory-original wiring harness designed specifically for the 2015 Subaru WRX STI. This direct-fit replacement ensures complete electrical integrity between your engine's sensors, actuators, and control systems — delivering the same performance and reliability as the harness installed at the factory. Whether you're restoring a damaged harness or performing a full engine build, this OEM part guarantees a perfect fit with zero modifications required.

Key Features & Benefits

• Genuine Subaru OEM Quality — Manufactured to exact factory specifications, ensuring full compatibility with all 2015 WRX STI engine management systems and sensors.
• Exact-Fit Guarantee — Engineered as a direct replacement; no cutting, splicing, or adapter harnesses needed for installation.
• Factory-Grade Wiring & Connectors — Uses the same wire gauges, insulation materials, and connector terminals as the original Subaru assembly line harness.
• Preserves Engine Management Integrity — Maintains proper signal transmission to and from the ECU, injectors, ignition coils, sensors, and ancillary systems.
• Long-Term Reliability — OEM materials resist heat, vibration, and engine-bay chemicals better than generic aftermarket alternatives.
• Backed by Subaru — Eligible for Subaru's genuine parts warranty when purchased through an authorized Subaru parts outlet.

What's Included

• 1x Genuine Subaru Engine Wiring Harness (Part #24020AF990)

Specifications

Fitment & Compatibility

This engine harness is confirmed for the following Subaru vehicle:

Important: Part #24020AF990 is specific to the 2015 STI application. Always verify your vehicle's VIN and model year before ordering. If you are unsure of compatibility, consult your Subaru dealer or reference your OEM parts diagram.

Installation

This engine harness is a direct OEM replacement and is designed to connect exactly as the factory harness did. While the physical fitment requires no modifications, full engine harness replacement is a labor-intensive procedure that involves disconnecting and reconnecting numerous electrical connectors throughout the engine bay. Professional installation by a qualified Subaru technician or experienced mechanic is strongly recommended to ensure all connections are properly seated and the engine management system functions correctly after installation.