PR-BTHR003-0 + PR-BTHR003-1 - 2.0 WRX Engine Harness
Installation Guide
Fitment Notes
This is an OEM replacement for USDM 2.0 WRX applications, so it will come with all necessary emissions equipment.
For JDM WRX and STi applications, you will add the intake AVCS wiring by following this document.
Knock Sensor Update (If Needed)
This connector is included if the knock sensor on the harness does not match. This change is usually for 2005 WRX models, but some 2004 WRX models utilized it.
If needed, will replace
These connectors use the same terminal, so just depin the current and plug it into the replacement. Remember to swap the cavity plug over so it stays sealed.
Remember to swap the brown cavity plug over so it stays sealed.
Depinning help can be found in the link below.
PCV Connector for 2004-2005 WRX
This connector is only needed for 2004 and 2005 WRX models. For the 2002-2003 WRX, this will remain open since it is not in use.
September 2025 Update - A cap will be included with the kit for the PCV if it’s not used.
Install Video
Engine Connector Overview
Injector Cylinder Color Code - Signal Wire
Cylinder 1 - Green with Red Stripe
Cylinder 2 - Blue with Red Stripe
Cylinder 3 - White with Red Stripe
Cylidner 4 - Black with Red Stripe
The white coil packs will be in front of cylinders 1 and 2.
The black coil packs will be located in cylinders 3 and 4 in the rear.