I'm not sure if this question is ok to ask here but I'm hopeless in finding sufficient hardware for it to be done.
I have two pairs of keys to the car and one of them stopped working so I want to repair it or at least check what's wrong with it. After measuring it with a multimeter, I came to the conclusion that it's working properly but it still won't open the car.
So I would like to check if the signal is even sent, for that I need some kind of radio receiver (at least I guess that is what I need). I would like to buy a receiver that can be plugged into PC by USB where I would be able to check the frequency and data sent for future comparison with working key.
A link or some key phrases which I need to look for would be great if anyone does know something like that to buy.