...

public autofahrzeugheiler()
{
    if(isPlayerAnAdmin(playerid,4))
    {
            for (new i = 0; i < MAX_PLAYERS; i++)
        {
            if(IsPlayerConnected(i))

            {
                new Float:health, auto;
                if (IsPlayerInAnyVehicle(i))
                {
                    auto = GetPlayerVehicleID(i);
                    GetVehicleHealth(auto, health);
                    if (health < 1000)
                    {
                    SetVehicleHealth(auto, 1000);
                    RepairVehicle(auto);
                    }
                }
            }
        }
    }
    return 1;
}