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So your Check Engine Light (CEL) came on. For a lot of people this light is a mystery and hints at some unseen danger in the guts of your car. Others ignore it until it goes away, or just let it stay on.
The Check Engine Light (also known as the Malfunction Indicator Light) exists to notify a driver that the engine computer has noticed a problem and requires attention. The on-board diagnostics system and engine control unit are in charge of monitoring a bunch of things like car emissions, and if they get a signal that’s abnormal, it triggers the CEL.
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