steven is the guy who created car mod (he posted it on amxx). I don't know how the hell peeps get car mod to work, on most versions I either get a compile error or it doesn't let me into the car. Are you using amxx 1.01 or amxx 1.71? If your using amxx 1.01 and tried alterring it to work with it then as far as I know its fine to post here.
Also I noticed you have an extra / in your precaching.
Ummmm, there is no letInCarFunction method, you never call getInCar or leaveCar...............