what i found out is the O2 sensor has 3 wire, 2 are for a heater to keep temp constant.
The third will be power to the computer.
The O2 sensor is thermo-couple device= gives off electricity when heated. Same deal as in most gas heater, power to turn on gas, make it a safe unit.
The median voltage is 450 millivolt, too low = lean engine the Computer will dump more gas so it will be overly rich,

high voltage the computer perceives it as rich so it will lean out the engine.
next week i am trying to hook up a small battery to the O2 sensor wire to see if i can beat the BC emission too. We call it Aircare here, or airscare.
Is going away in a couple more yrs. That will make life a bit more easy for weasel like Yours truly.

The computer should resides in the right front passenger foot well, u pull the carpet, a black hard plastic there, a small 10 mm nut to undo it. The comp should be there.
A wire should come thru. This is repost from someone else.

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