public OnPlayerKeyStateChange(playerid, newkeys, oldkeys)
{
    if(newkeys == KEY_ACTION)
    {
        if(IsPlayerInAnyVehicle(playerid))
        {
            new vehicleid = GetPlayerVehicleID(playerid), engine = 0, lights = 0, alarm = 0, doors = 0, bonnet = 0, boot = 0, objective = 0;
            GetVehicleParamsEx(vehicleid, engine, lights, alarm, doors, bonnet, boot, objective);
            if(engine == 1)
            {
                SetVehicleParamsEx(vehicleid, 0, lights, alarm, doors, bonnet, boot, objective);
                return 1;
            }
            else
            {
                SetVehicleParamsEx(vehicleid, 1, lights, alarm, doors, bonnet, boot, objective);
            }
            return 1;
        }
 }
return 1;
}