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What is difference between flashing and steady check engine light in 1999 ford ranger?

A flashing check engine light in a 1999 Ford Ranger indicates a severe engine misfire that could damage the catalytic converter. You should stop driving the vehicle immediately and have it towed to a mechanic.

A steady check engine light indicates a less severe problem, such as a loose gas cap or a faulty oxygen sensor. You can continue to drive the vehicle, but you should have the problem diagnosed and repaired as soon as possible.