How many sensors do I have

Dozens. Go to the Rock Auto web site, select your model and all the other information you didn't bother to include, then look up all the different sensors. They're used with the Engine Computer, some for the Transmission, others for the heater and AC systems, automatic load-leveling suspension system, etc. There may even be some in the steering system. At last count, (a few years ago), some GM cars could have up to 47 computers, (most of them unnecessary), and they all rely on numerous sensors to know what's going on.