Engine wiring harness installation

BRYCE CLINE

MEMBER
2007 MAZDA 3
2.0L
4 CYL
2WD
AUTOMATIC
80,000 MILES

Someone removed the wiring harness and I am trying to find out where the connection for the one I have in picture below. It's the harness that comes around front of engine and ends at the o2 sensors. My only other thought is it's the harness that runs around the core support.

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3 Replies

JACOBANDNICKOLAS

MECHANIC
109,901 POSTS

Hi,

If they end at the oxygen sensors, it either goes to the PCM or power. Can you tell me the wire colors?

I attached three pics below. I highlighted where the wires from the sensors ends up. Take a look through them and see if the wire colors match.

Let me know.
Joe

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Tuesday, May 19th, 2020 AT 8:30 PM

BRYCE CLINE

MEMBER
32 POSTS

Hi Joe,

Thank you for the schematic. I see what's going on now, the harness that runs below that one is older then 2007. I seen your diagram and what I have to change that lower harness and it has the correct plug that eliminates the one in question cause it plugs into it.
Thank you Joe, greatly appreciated.

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Wednesday, May 20th, 2020 AT 9:42 AM

JACOBANDNICKOLAS