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# What's the cause of the blinking check engine light blinking?
The check engine light is one of the most important dashboard lights in your car. It's usually illuminated when there's a problem with the car's engine, emissions system, or other critical components. There are many different reasons why the check engine light might come on, but the most common cause is a faulty sensor. The sensors in your car's engine are responsible for sending information to the computer about how the engine is running. If one of the sensors isn't working properly, it can cause the check engine light to come on. In some cases, you might be able to fix the problem by cleaning or replacing the sensor.
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