What Causes the Car Malfunction Light to Illuminate?

1 Answers
GiaFitz
07/28/25 8:14pm
Car malfunction light illuminates due to: 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 engine's operational burden; 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 buildup or knocking issues, which are monitored by the engine's oxygen sensor; 5. False faults: Occur due to bumps during driving, tampering with certain engine connectors, or temporary ECU signal interruptions.
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