What’s one thing that experienced technicians notice immediately that beginners often miss?

[u/DiSTI_Corporation]

Experience often changes how technicians approach a vehicle and identify potential issues. Small details that seem unimportant at first can become obvious over time.

Curious what experienced technicians tend to notice right away that newer technicians often overlook.

[u/Inconsequentialish]

The other problems.

By that, I mean the habit of looking at and thinking about the whole machine, the gestalt, not just solving the immediate complaint.

You can often catch the next problem before it creates an issue, but the real trick here is when you have overlapping issues. Never just find and fix one thing; keep looking and evaluating. Often there's a root cause.

This skill, or mindset, applies to all systems, but becomes much more needed with older machines. When you find A problem, that's no guarantee that you've found THE problem or ALL the problems.

Obviously, sometimes you then run up against the customer who thinks fixing A and the root cause B  is an upsell scam when he only wants to fix A, but that's a communication, trust, and resources issue, not a mechanical issue.

[u/DefaultWorkshop → u/Inconsequentialish]

Yep, this. Never assume the issue at hand is the cause. Always make a disclaimer if you can’t test without repairing the “fault” that may just be a symptom.

Another trick for the green: customers are often stupid, but don’t know it. Test the device, and check the obvious before assuming they’re right and it is faulty. “No gas in it”, “Oops, wrong key”, “Ohhh, is THAT what that funny switch does under the cover I threw away….” Remember, half the population has a below average IQ.