What are the reasons for the warning light to appear?

[EvelynAnn]

The reasons for the warning light to appear are as follows: 1. Sensor issues: When the water temperature, crankshaft position, air flow, intake temperature, or oxygen sensors are damaged, have poor contact, or signal interruption, the car's ECU cannot accurately obtain engine data. 2. Maintenance issues: Irregular maintenance and poor driving habits can increase the burden on engine operation. 3. Fuel quality issues: The fuel added to the car has a specific grade, and failure to add as required can cause engine wear. 4. Poor mixture combustion: This can lead to engine carbon deposits or knocking problems, which will be detected by the engine's oxygen sensor. 5. False faults: Knocks during driving, tampering with a certain plug on the engine, or temporary signal interruption in the ECU.