Create a new event, this will be the vehicle. Set the charset of this event tp the charset you want the vehicle to be.
Now, create a new party member with the same charset as the vehicle.

Now, time for the script!
Make a Call type common event called Vehicle in. Now, lets say your vehicle's party member name is Vehicle, and your normal hero's name is Hero.
In the common event, put in this coding:

Change party members Hero remove
Change party members Vehicle add
Switch VehcleDispear on

Now, back to the event, make a second page without a charset (a blank charset will do). Make it activated by the VehcleDispear switch.

Now, make one more common event Parallel Proccess. Have it activated by the Vehcle Dispear switch. Have it called Car Out.
Have the coding in it be:

Activated by touching Shift key.
Change party members Hero add
Change party members Vehicle remove
Switch Vehcle Dispear off

Now, back to the 2nd page in the event. Make it have a custom pattern and make it frequency 8. Have it be follow hero. And make it repeat. And make sure that second page speed is set to the highest speed it can get to.



Now, whenever you go into the vehicle, just go by the vehicle and press enter. It will be like a custom vehicle without the music or anything. To get out of the vehicle press the Shift button on the keyboard. The vehicle be right by you, NOT wherever you put the event in the first place!
Note that music can be added, but it just makes things a bit more complicated, though


Well, hope this helps someone in need for a tutorial on how to create a vehicle as an event