Why would the Check engine light and car started to shake a lot?

The check engine light can illuminate for various reasons, often indicating a problem with the engine or emissions system. If the car is shaking, it could be due to issues such as misfiring spark plugs, a malfunctioning fuel injector, or problems with the ignition system. Additionally, a failing sensor, like the mass airflow sensor, could disrupt the air-fuel mixture, leading to rough idling and vibrations. It's essential to have the vehicle diagnosed promptly to prevent further damage.