[JimmyCh]

pawn Код:

public OnVehicleDamageStatusUpdate(vehicleid, playerid)
{
    new vehiclehealth = GetVehicleHealth(vehicleid);
    if(vehiclehealth < 25)
    {
        new engine, lights, alarm, doors, bonnet, boot, objective;
        GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
                SetVehicleParamsEx(vehicleid,0,lights,alarm,doors,bonnet,boot,objective);
        SendClientMessage(playerid, 0xFF0000FF, "Text");
    }
    return 1;
}

You did {vehiclehealth < 25) not (vehiclehealth < 25), typo I guess.