Cool Is Check Engine Light Always Bad Ideas. Web is the check engine light always bad? Web the check engine light can come on for hundreds of different reasons or trouble codes.
In many cases, the cel is a good thing, in a way. Web if your check engine light is blinking, it could indicate a serious issue with your vehicle's engine. Web if the spark plug wires are worn or damaged, they can cause misfires, which trigger the check engine light.
