If you are referring to the coolant temperature sensor which sends signal to your dash guage and controls when the radiator fans come on refer to the following website if you have a 4 cyl vehicle. http://www.mazdaforum.com/archive/threads/coolant-temp-sensor-how-to-replace-pix-4746-1.html
Follow + battery cable should connect to solenoid
I had the same problem on my 98 Mazda 626 and the O2 sensor was faulty.....
where is the location of all o2 sensars in 99 Mazda 626
on the throttle body
Yes, it has a speed sensor, about $125 online.
On the 2000 626 it is directly under the air filter box.
The cooling sensor, often referred to as the coolant temperature sensor, on a Mazda 626 is typically located near the engine block, usually on or near the thermostat housing. It is positioned to monitor the temperature of the coolant as it circulates through the engine. In some models, it may also be found near the cylinder head. Always consult the vehicle's service manual for the exact location, as it can vary by model year.
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Mazda 626 frm 1996 doesn't have O2 sensors, have you ECU/PCM inspected, it might have a minor damage.
the ABS sensor is bad.
It's part of the distributor
You did not specify which O2 sensor it is. Is it sensor 1 bank 1, sensor 2 bank 2, sensor 2 bank 1, or sensor 1 bank 2. There are four O2 sensors on a mazda 626