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02 sensor wiring on 2003 Toyota Corolla

I am installing an aftermarket 02 sensor. Wiring color codes are different than my OE sensor.
My OE wiring has 2 Black wires, 1 Blue wire and 1 White wire.
Iknowthe2 Black wires are the Heater wires. I need to know whichistheSignalwire and which is the Ground wire on a 2003 Corolla.

I know which wires are which on the new aftermarket sensor so that is not an issue.

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  • jchale Apr 19, 2009

    It has a PO420 code.. All the troubleshooting i have read says
    changethe upstream Oxygen Sensor. I have not seen any reference to
    "AF"sensors.
    If i can figure out which wire Blue or White is the Signal wire i know where the other wires go.
    Thanks, Jim

  • GENE FARLEY May 11, 2010

    Why are you changing your o2 sensor? What is the code? A 03 Corolla has AF sensors before the cat, not o2 sensors.

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A Corolla in snake skins..

my guess is you found out , all 02 use different color wires.
yes, that is true. why not name the new sensor makers name.
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so when is this.???? 1.6L SOHC, or the DOHC?

here is a prizm link page, it shows how to get all this. data.

http://www.fixkick.com/PRIZM.html


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Rules of road. 02
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7afe

bd1099ee-c02c-4aba-966e-1764a93d43b9.jpg

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-->

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