[[XST]O_x]

OnPlayerEnterVehicle is called when a player presses 'F'/'enter' near an valid vehicle.

OnPlayerStateChange should help with your case.

pawn Код:

public OnPlayerStateChange(playerid,newstate,oldstate)
{
    if(newstate == PLAYER_STATE_DRIVER)
    {
        new string[128];
        if(IsBuyableCar[GetPlayerVehicleID(playerid)]!=0)
        ....