2004 Toyota Corolla O2 sensor Wire ID

Tiny
EDPETE
  • MEMBER
  • 2004 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 110,000 MILES
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.
Sunday, January 18th, 2009 AT 7:16 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 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.
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Wednesday, January 21st, 2009 AT 9:11 AM

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