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Rear o2 sensor wire colors

9248 Views 1 Reply 2 Participants Last post by  2.5x_sleeper
Have a 2003 forester xs the harness for the downstream o2 sensor broke from the car the wire colors are yellow\ red , brown/white , yellow and white ( four wires) How do the hook up to the sensor that has 2 white 1 black and 1 gray wire. Which wires from the car are heater and signal wires
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@Jerome Bonicos I see this is your first forum post, so welcome to the forum from Oregon! :biggrin:

The wiring diagram below is for the '03-'04 NA engine. :wink:

Note that the wire colors on the O2 sensor may not match the colors on the chassis wiring connector. You may have to go the the manufacurer's website to get the functions of the wires if you're attempting to repin an O2 sensor connector. :confused:

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