Oxygen Sensor Relay: Description and Operation

Fuse/Relay Panel Location:

Heated Oxygen Sensor (HO2S) Relay is located in position # 13 of the Fuse/Relay Panel, which is under the dash on the drivers side.

The Heated Oxygen Sensor Relay is energized by the Motronic control module as soon as an engine speed signal is received then it supplies current to the oxygen sensor heating element.