O2 Sensor wiring (4 wire)

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Feb 9, 2004 | 08:32 AM

Holeshot2418

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Cruising

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From: Clinton MD

O2 Sensor wiring (4 wire)

I am trying to install a autometer air/fuel ratio guage, but my O2 sensor has 4-wires and I'm not sure which one is the signal wire. 1-white, 1-purple, 2-look brown. I also know that I have to connect after the wiring harness. Any help would be highly appreciated.

:banghead:

Feb 17, 2004 | 11:30 AM

Holeshot2418

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Cruising

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From: Clinton MD

Re: O2 Sensor wiring (Holeshot2418)

Does anybody have an idea which one is the signal wire? HELP

Feb 17, 2004 | 01:06 PM

CFI-EFI

Race Director

Joined: Sep 2000

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From: The Top of Utah

Re: O2 Sensor wiring (Holeshot2418)

My O2 has 1 wire. Not much guess work there. I'd get my hands on a wiring diagram, if I were you.

RACE ON!!!

Feb 17, 2004 | 01:10 PM

scorp508

Team Owner

Joined: Mar 2000

Posts: 83,381

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From: Boston, MA

Well I can tell you this much at least. The stock sensor on my car has a purple wire so I would guess that is the signal wire. The two brown ones are probably for ground and 12v and it won't matter which one you put on what. As for the white wire I don't have a guess.

Feb 17, 2004 | 01:39 PM

FD2BLK

Safety Car

Joined: Dec 2002

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From: Charleston SC

Re: O2 Sensor wiring (Holeshot2418)

I will look tonight and tell you the wire colors for the signal wire

Feb 17, 2004 | 01:45 PM

Holeshot2418

Thread Starter

Cruising

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From: Clinton MD

Re: O2 Sensor wiring (84LT1)

Thanks 84LT1, it will be much appreciated.... :party:

Feb 17, 2004 | 02:03 PM

ZylaRace

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From: Norcross GA

Re: O2 Sensor wiring (Holeshot2418)

2 wires for the 12v heater
1 wire for the sensor voltage (ouput signal)
1 wire for the sensor ground (sensor metal case)

Feb 17, 2004 | 03:04 PM

JasonL

Melting Slicks

Joined: Apr 2000

Posts: 3,198

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From: Northern CA

Re: O2 Sensor wiring (Holeshot2418)

'96 service manual sez (HO2S means heated O2 sensor):

tan - HO2S signal low
purple - HO2S signal high
black - heater ground
brown - heater 12V

I'm guessing purple is what you want.