[Scenario]

ZCMD and SSCANF:

pawn Код:

command(vrepair, playerid, params[])
{
    #pragma unused params
    new string[128];
    if(PlayerStatistics[playerid][pAdminLevel] < 3)
        return false;
    if(!IsPlayerConnected(playerid))
        return SendClientMessage(playerid, COLOR_WHITE, "You are not logged in!");
    if(!IsPlayerInAnyVehicle(playerid))
        return SendClientMessage(playerid, COLOR_WHITE, "You are not in a vehicle!");

    RepairVehicle(GetPlayerVehicleID(playerid));
    SendClientMessage(playerid, COLOR_WHITE, "You have fixed your vehicle.");
    return 1;
}

It checks if the person who executed the command is in a vehicle, if they are, it continues if not, it won't. You'll have to edit the admin check to your liking. Hope this helps.