What Causes the Malfunction Indicator Light to Illuminate?

[VanMalachi]

The reasons for the malfunction indicator light to illuminate are: 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: Not maintaining the vehicle on schedule and poor driving habits can increase the burden on the engine's operation; 3. Fuel quality issues: The fuel added to the car has specific grades, and failing to add the required grade can cause engine wear; 4. Poor combustion of the air-fuel mixture: This can lead to engine carbon buildup or knocking problems, which are monitored by the engine's oxygen sensor; 5. False faults: These can occur due to impacts during driving, tampering with a connector on the engine, or temporary signal interruptions in the ECU.