If the engine light comes on and the car is running with no obvious problem, don't ignore it. Nowadays cars have their own CAN (car area network) just like we have the LAN and the WAN for our internet. The onboard computer is called PCM (power-train computer module) and it constantly run diagnostics checking for any misbehavior throughout the operating components with sensor to make sure the car isn't harming our environment. If the PCM senses any misbehavior, it will generate a trouble code, save it in its memory and turns on the MIL (malfunctioning indicator light aka engine light). When the light comes on, make sure to bring your car to our shop for a complete diagnoses free of charge. We will explain the consequences of that code, then you can decide fixing it.