You’re driving along in peace when suddenly the dashboard lights up with a flashing Check Engine light. Can you ignore it and drive as usual until the next oil change? No — a flashing light indicates greater urgency than a steady light. A steady (or amber or yellow-colored, if your indicator uses more than one color) Check Engine light typically warns of a lesser evil, such as a gas cap that wasn’t screwed on tightly, or a faulty sensor. 
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