What Causes the Warning Light to Illuminate?

[LaAlexander]

The reasons for the warning light illuminating 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 experience signal interruption, the car's ECU cannot accurately obtain engine data; 2. Maintenance problems: 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 it as required can cause engine wear; 4. Poor combustion of the air-fuel mixture: This can lead to engine carbon buildup or knocking issues, which are detected by the engine's oxygen sensor; 5. False alarms: These can occur due to impacts while driving, tampering with certain engine connectors, or temporary ECU signal interruptions.