Why does the engine fault light come on after starting the car?

[DelEmery]

Here are the detailed reasons why the engine fault light comes on after starting the car: 1. The vehicle fault light is usually caused by the fuel emission system. 2. When the computer receives the parameters from the oxygen sensor and the exhaust emissions seriously exceed the national legal standards. Poor combustion state: Poor engine combustion state is the main reason for the engine fault light to come on. 3. Engine knocking, usually there are three situations: (1) The car does not move. (2) The car moves, but the engine noise is too loud. (3) There is an obvious knocking sound from the cylinder. 4. Internal reasons for the engine fault light to come on: (1) Poor fuel quality. (2) The engine cylinder is not clean and has accumulated carbon deposits. 5. The computer cannot obtain engine data. 6. False fault. A fault code is reported, but the operation is normal, which may be due to an operation that exceeds the computer's control range, and the computer feedbacks a fault code.