2004 Toyota Corolla O2 sensor Wire ID

2004 TOYOTA COROLLA
110,000 MILES • 4 CYL • FWD • AUTOMATIC
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EDPETE
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  • 1 POST
THE CHECK ENG.CODE CAME UP P0133.I purchased a Bosch Universal oxygen sensor.
The wire color ref table does not help.
I need to know what the OEM sensor color code is.

Bosch table says there is one signal wire,two heater,and one ground.

I looked at diagram.The brown wire is ground.
Two wires go back to ECM black to OX1A and pink to HT1A.
Jan 18, 2009 at 7:16 PM
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MMPRINCE4000
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  • 8,548 POSTS
Use the old sensor as reference. If you can, return the universal unit and get a prewired one. The sensor output is very low voltage .1 to .9 and when you splice the wires using a butt connector, you have to have a good connection or you will get erratic readings.
Jan 21, 2009 at 9:11 AM