Hi Gabriel,
First thing to do is scan for trouble codes. All cars since 1996 are required to support the On-Board Diagnostics protocol (OBD-II), which stores diagnostic information on the car's operation. If the fault is serious enough, it will turn on the Check Engine Light (AKA the MIL, or Malfunction Indicator Light), but not all errors do.
In any event, chances are good there's a trouble code stored in your car's computer that may give you a clue as to what's going on with it. You can get a Bluetooth "dongle" that will plug into the car's diagnostic port for under $10 USD that can be used with free apps for your phone, or, at least here in the US, you can take it to most auto parts stores where they will scan the codes for you for free.
I'd suggest getting your codes scanned as the first step, then come back and let us know what you found and we can go from there.