I've purchased a Bosch premium O2 sensor kit with SmartLink. It comes with a wiring chart but I have 2 wires that are not on it. My original O2 sensor has a red and yellow wire along with gray and black. Which wires are the heater wires and which wires are the signal and ground?


These 2 links should help you out. These 2 video links give step by step instructions on the wiring of O2 sensors as well as how to install them.

Simple, step-by-step instructions to assemble and install a Bosch Premium Oxygen Sensor with SmartLink ..


O2 or Oxygen Sensor Heater (the 2 grey connectors are the heater +/-)


  • 3
    Can you bring the information to SE? as it is, this is a link only answer and is ripe for deletion. – Pᴀᴜʟsᴛᴇʀ2 Nov 1 '16 at 9:51
  • I think what @Pᴀᴜʟsᴛᴇʀ2 had in mind was a digest of what information the videos contained. – Lynn Crumbling Nov 1 '16 at 16:16
  • @LynnCrumbling - Exactly! Thanks for helping me clarify. No need for people to down vote this, IMHO. I'd just like to see the information posted here, is all. Hopefully The Heretic can accommodate. – Pᴀᴜʟsᴛᴇʀ2 Nov 1 '16 at 16:55

Not the answer you're looking for? Browse other questions tagged or ask your own question.