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It usually starts with a warning light. Maybe it’s the battery icon flickering on your dashboard, or the oil change reminder that refuses to go away even after fresh oil. You pull out your phone, search for a quick fix, and suddenly realize most diagnostic tools either cost too much or don’t do what you actually need. That’s exactly where budget scanners like Innova come into the picture. In this Innova 5210 Review: Best Under-$100 Scanner for Battery Testing & Oil Resets?, …