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"It works by plugging into the car's computer system and displaying a “trouble code.” An engine code reader/scanner is <strong>worth buying</strong> if you're a fairly competent amateur mechanic who understands how an engine works. But it's not a silver bullet that will always tell you exactly what's wrong."
<https://www.engineeringchoice.com/how-to-use-diagnostic-car-code-reader/>