[LeBoyce]

Here is no debug needed.

You get the vehicleid

Код:

    new CarCheck = GetPlayerVehicleID(playerid)

BEFORE the player is in the vehicle. So it will return 0 and none of your car check will work.
Just use 'vehicleid'.

Although

Код:

            SendClientMessage(playerid, COLOR_RED, "* %s spins a key and tries to start vehicle engine.*");

%s is not supported in SendClientMessage(); You have to get the player name at first then format a string and then send it via SendClientMessage()