I don't know which is which, but one sends a signal to the temp gauge on the dash, the other sends a signal to the car's computer. Usually the one going to the car's computer is listed under fuel injection parts.
Ok I believe i have the right part. I can visually see the sensor on the drivers Left hand drivers side but how do you get to it? Do I need to disconnect the upper coolant hoses in order to gain access or do I need a special tool like an o2 socket wrench?