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The check engine light came on at the worst possible time, late at night, far from home, and with no mechanic in sight. Ten years ago, that would’ve meant guesswork, a tow truck, or an expensive diagnostic visit the next morning. In 2026, it means plugging in a small device and getting real answers in seconds. Modern vehicles generate thousands of data points every second, and the difference between panic and confidence often comes down to the quality of the diagnostic tool in your glove b …