What does it mean when the car's check indicator light comes on?

[Doris]

Car check indicator light is the engine fault light, the check indicator light on means the engine has a fault. The following is a detailed explanation of the reasons why the car check indicator light comes on and the solutions: 1. Excessive engine carbon deposits: When the car runs at low speed for a long time, it is easy to produce carbon deposits, which will block the oil system. Solution: Perform carbon deposit cleaning. 2. Oxygen sensor failure: The oxygen sensor is a ceramic element located on the engine exhaust pipe, used to detect and control the ratio of oxygen to fuel. Prolonged use can cause the computer of the electronic fuel injection system to fail to obtain information about the oxygen concentration in the exhaust pipe, resulting in a high concentration of the mixture in the engine and increased fuel consumption. Solution: Repair or replace the oxygen sensor.