2004 wrx wiring harness | eBay Find great deals on eBay for 2004 wrx wiring harness. Shop with confidence. Skip to main content. eBay Logo: 2004 SUBARU WRX ECU ENGINE WIRING HARNESS PLUG CONNECTORS CUT . Pre-Owned. $32. 2002-2004 Subaru Impreza WRX SRS Wiring Harness Rear 81502FE240 OEM 02-04 See more like this. 2004 Subaru Impreza WRX Wiring Harness - Subaru Parts SubaruPartsDeal offers the lowest prices for genuine 2004 Subaru Impreza WRX parts. Parts like Wiring Harness - Main are shipped directly from authorized Subaru dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options.