Engine warning light will appear because of any reason. Most of the reason is sensors. If the sensors have detected abnormal reading. Abnormal mixture (air/fuel/fire) in the engine or system. It will give signal to engine control module (ECM). The ECM will make that warning light appears. It's not only about the engine. Most of TOYATA ECM is link with the transmission, if the abnormal activity on transmission was detected, it will also make the warning light appear. Simple example for TOYOTA VELLFIRE AGH30 transmission (solenoid A performance stuck off) the warning light will appear. This warning light appears is for remaining car owner to stop the car or go to the nearest service center for troubleshooting the warning light issued.
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