I thank both of you for your quick responses. I didn't know the car had such sensor, neither what are the consequences of having it disconnected, because as I mentioned before, I haven't noticed any malfunction with the car. I will check tomorrow if I can see where it belongs, but I have the feeling that I won't find anywhere to connect it.

I'm saying that because this car was in crashed and "restored" (not so well) before I bought it, apparently nothing too serious, mainly aesthetics: damage to the driver's side front fender, broken headlight, damaged bumper, radiator upper support, as well as the grill. Now that I found this loose cable, I'm guessing it's going to remain loose, but I'm gonna check tomorrow under the daylight.

Thank you again. This forum has helped me a lot to know my car and also to save some cash.