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A steady check-engine light usually means an emissions-related fault — a loose gas cap, an oxygen sensor, or a catalytic converter issue — and it's safe to drive a short while to get it scanned, though you shouldn't ignore it for long. A FLASHING check-engine light is different: that's typically an active misfire that can damage your catalytic converter within minutes of driving. If it's flashing, ease off the gas and get it looked at as soon as it's safe to. Any shop with an OBD-II scanner (most do) can pull the actual fault code in a few minutes, often for free or a small diagnostic fee.

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