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Have you tried to disconnect the battery for a while, since you changed the Oxygen sensor? The light won't just go out by itself, even though you most likely fixed it. If you clear the code, and it comes back, then you need to dig deeper!
Overheating on the SW20 (Mr2) is usually down to one of the following:
Air lock:From a badly bled coolant system (Easy fix) Thrmostat failure:Preventing the coolant getting to the front radiator(Easy fix) Water pump failure:(Water pump can be fubar(Not so easy a fix but not too expensive for the mechanically minded) Head gasget:It can go,when it does it blows all the coolant out of the radiator(Expensive to fix and not easy at all) Radiator filler cap:Common fault on older cars but less than 10 bucks to fix(Not even a problem) Heater pipe leak:They don't call them the pipes from hell without good reason.(Pain in the neck if they go,not expensive to repair but takes ages)