What does a key symbol on the dashboard indicate?

[LeReid]

A key symbol on the dashboard represents the engine immobilizer system, which is a security device designed to prevent vehicle theft, unauthorized movement, and loss of items inside the car. Below are its functions and maintenance tips: 1. The engine's function is to convert the thermal energy of gasoline into mechanical energy by burning it in a sealed cylinder to expand gas and push the piston to perform work. 2. Methods for maintaining a car engine include: regularly changing the oil and oil filter, using lubricating oil of the appropriate quality grade, periodically cleaning the radiator, ensuring good crankcase ventilation with regular cleaning, and regularly cleaning the fuel system.