Can somebody see the error(s) here ? C# Scripting

Hey, i have this script. It is about entering and exiting cars. I have many cars in the project, every car has this script attached, and configured. But i enter this car, then i exit it, everything works fine, but after i drive, and enter/exit few cars, script gets crazy - as i - enter one car, when i pres the 'exit key', instead of exiting a car, i end up driving another, then press again exit - i end up driving two cars in the same time....weird. This is the script:

 using UnityEngine;
 using System.Collections;
 
 public class EnterExit : MonoBehaviour {
     
     
     public Drivetrain Drivetrain;
     public CarController CarController;
     public SoundController SoundController;
     public  GameObject Car;
     public  GameObject ExitPoint;
     public  GameObject CarCamera;
     public  GameObject Player ;
     public  GameObject PlayerCamera;
 
 
     bool IsPlayerInCar = false;
     bool IsPlayerInTrigger = false;
     // Use this for initialization
 void Start () {
     CarController  = GetComponent (typeof (CarController)) as CarController;
     SoundController  = GetComponent (typeof (SoundController)) as SoundController;
 
     }
 
     
 void OnTriggerEnter(Collider Player) {
         
     IsPlayerInTrigger = true;
     }
 void OnTriggerExit(Collider Player) {
     
     IsPlayerInTrigger = false;
     }
 
     // Update is called once per frame
     void Update () {
 
     if (Input.GetKeyDown(KeyCode.F)) {
         if (!IsPlayerInCar && !IsPlayerInTrigger) 
             { 
             // Actions to perform when not in car, and not in trigger
             }
         if (!IsPlayerInCar && IsPlayerInTrigger) 
             { 
                 // Actions to perform when not in car but in car's trigger
                 CarController.enabled = true;
                 Drivetrain.enabled = true;
                 CarCamera.camera.enabled = true;
                    CarCamera.gameObject.GetComponent<AudioListener> ().enabled = true;
                 PlayerCamera.camera.enabled = false;
                 PlayerCamera.gameObject.GetComponent<AudioListener> ().enabled = false;
                 Player.gameObject.transform.parent = ExitPoint.transform;
                 Player.transform.localPosition = new Vector3(0,0,0);
                 Player.transform.localRotation = new Quaternion(0,0,0,0);
                 Player.gameObject.SetActive(false);
                 StartCoroutine(EnterCar());
     }
             
         if (IsPlayerInCar) 
             { 
                 // Actions to perform when in car (to exit car)
                 CarController.brake = 999;
                 CarController.enabled = false;
                 Drivetrain.enabled = false;
                 CarCamera.camera.enabled = false;
                    CarCamera.gameObject.GetComponent<AudioListener> ().enabled = false;
                 PlayerCamera.camera.enabled = true;
                 PlayerCamera.gameObject.GetComponent<AudioListener> ().enabled = true;
                 Player.gameObject.transform.parent = null;
                 Player.transform.localRotation = new Quaternion(0,0,0,0);
                 Player.gameObject.SetActive(true);
 
                 StartCoroutine(ExitCar());
                              
             }
         }
     }
 IEnumerator EnterCar()
     {
     yield return new WaitForSeconds(0.5f);
     IsPlayerInCar = true;
     SoundController.EngineOn = true;
     }
 IEnumerator ExitCar()
     {
     yield return new WaitForSeconds(1);
     IsPlayerInCar = false;
     SoundController.EngineOn = false;
 
     }
 }