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When that dreaded check engine light flickers on, many drivers rush to the mechanic without realizing they can take the first step themselves. A car diagnostic tool, also known as an OBD2 scanner, is a powerful device that helps you uncover hidden issues in your vehicle before they become expensive repairs. But here’s the catch—using an OBD2 scanner incorrectly can lead to confusion, misdiagnosis, or even overlooking serious problems. In this guide, we’ll break down how to saf …