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Totally agree. Obviously there is usually something wrong when customers have gone out of their way to bring their vehicle in. Your idle example is a good example of techs relying too much on their diagnostic computer. I would say that till recently, 50% of problems do not show up there. But the latest stuff (MY 2011 + in HD trucks, anyway) is pretty good at self diagnostics. Every complaint I have had in MY 2011+ trucks so far has been cured following fault code diagnostics or an engine software update. They really have come a long way in that respect.
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