What does it mean when a car displays 'Check Engine System'?

[DiGemma]

The reasons why a car displays 'Check Engine' are as follows: The message 'Check Engine System' means that the engine needs to be inspected to see if there is a fault in the emission system or an issue with the oxygen sensor. The owner should take the car to a 4S shop to read the fault code and identify the specific cause. Extension: 1. The engine consists of three major parts and five service systems: the engine block assembly, the crank-connecting rod mechanism, the valve train, the ignition system, the starting system, the lubrication system, the cooling system, and the fuel supply system. 2. The functions and basic components of each part are as follows: the engine block assembly supports the entire engine and also houses the crankcase, cylinders, etc.; the crank-connecting rod mechanism converts the reciprocating motion of the piston into the rotational motion of the crankshaft, which is then output, including components like the connecting rod and crankshaft; the valve train supplies fuel and air to the cylinders and expels exhaust gases, composed of components such as tappets, valves, and control circuits.