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Re: oxygen sensors
| Posted By: | OldMage |
| Posted On: | December 24, 2003 at 5:03 pm GMST |
James wrote:
> i've got a 91 celica st 1.8. A few weeks ago, the
> oxygen sensor popped off it's position bolted to
> the exhaust pipe forcing me to buy a new one. in
> the interest of saving money, i purchased an
> aftermarket part which was supposed to be universal
> but when i removed the existing oxygen sensor, i
> noticed it has four wires whereas the universal type
> only had two wires. anybody know if this neccesarily
> means that the o2 sensor is incompatible with my car
> or can i make some sort of adjustment and hardwire
> it to the existing terminal. i'm not sure being that
> i have a limited knowledge of wiring. any help is
> greatly appreciated.
> thank you.
4-wire sensor is heated (2 wires) w/ a reference ground for the O2 signal (other 2 wires). I expect there are 1 white, 2 black and one other (green?). The 2 that are the same color are the heater, which you don't have to wire up, or you can wire to a relay controlled by the IGN circuit. Polarity of these 2 doesn't matter.
The remaining 2 should be spliced to the old connector from your bad O2 sensor, then plugged into your car's plug.
"OldMage"
'83 Celica GT-S coupe, EFI hybrid
Camas, WA USA
http://speedtoys.com/~oldmage
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