Subaru OEM Engine Wiring Harness (03-05 WRX) | 24020AD080

Overview

This is a Genuine Subaru OEM Engine Wiring Harness (Part #24020AD080), designed as a direct factory replacement for 2003–2005 Subaru WRX models. As an authentic OEM component, it guarantees an exact fit, proper connector alignment, and full compatibility with the vehicle's electronic systems — no modifications or adapters required. Whether you're replacing a damaged harness or performing a restoration, this is the factory-correct solution.

Key Features & Benefits

• Genuine Subaru OEM Part — Built to the same factory specifications as the original, ensuring reliable performance and longevity.
• Exact-Fit Guarantee — Engineered specifically for the 2003–2005 Subaru WRX; every connector, bracket, and routing point matches OEM standards precisely.
• Factory-Grade Wiring & Insulation — Uses OEM-spec wire gauges and heat-resistant insulation to withstand the demanding under-hood environment of the EJ205 turbocharged engine.
• Plug-and-Play Installation — All connectors are pre-terminated and labeled to factory spec, minimizing installation time and eliminating guesswork.
• Preserves Vehicle Integrity — Maintains factory wiring architecture, protecting ECU calibration, sensor readings, and emissions compliance.
• Backed by Subaru Quality Standards — Manufactured under Subaru's strict quality control processes for OEM replacement components.

What's Included

• 1× Genuine Subaru OEM Engine Wiring Harness (Part #24020AD080)

Specifications

Fitment & Compatibility

This engine wiring harness is a direct OEM replacement for the following vehicles:

Note: This harness is specific to the WRX variant. It is NOT compatible with the WRX STI or naturally aspirated Impreza models for these years. Always verify your part number against your VIN before ordering.

Installation

This engine wiring harness is a direct OEM replacement and is designed for plug-and-play fitment. However, full engine harness replacement is a complex procedure that involves disconnecting the battery, removing engine bay components to access all harness routing points, and carefully transferring connectors one at a time to ensure correct placement. Professional installation by a qualified Subaru technician or experienced mechanic is strongly recommended to avoid damage to sensors, the ECU, or electrical connectors. Always disconnect the negative battery terminal before beginning any electrical work.