Don't let an old rear oxygen sensor sub harness fail and cause ECU damage when the power wire grounds out on either the transmission or downpipe. Also great for turbo engine swaps that do not utilize the turbo transmission with attached sub harness or sub harness was not received.


Built with military grade materials to withstand the harsh environment underneath the car that includes heat, vibration, and debris.


Standard length is 30 inches. Custom lengths available on request. If you need a short extension please click here. We have an add on option of a vinyl boot which protects the Rear O2 Sesnor from heat, dust, and debris.


Compatible Cars:

  • 2002-2014 WRX
  • 2004-2014 STi
  • 2004-2014 Forester Turbo
  • 2005-2014 Legacy Turbo

Rear O2 Sensor Replacement Sub Harness