What Causes the Engine Fault Light to Illuminate in a Car?

[DiAlice]

Reasons why a car displays an engine fault: Sensor issues: The sensors mentioned here include coolant temperature, crankshaft position, air flow, intake air temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or experience signal interruption, the car's ECU cannot accurately obtain engine data, which will cause the engine fault light to illuminate. Fuel and oil quality issues: Fuel and oil quality includes both gasoline and engine oil. The fuel added to a car generally has a specific octane rating, while engine oil can be semi-synthetic or fully synthetic. Manufacturers usually recommend that owners use the specified fuel and oil. If the owner does not follow these recommendations, prolonged use can lead to engine wear. Poor combustion of the air-fuel mixture: Faulty spark plugs, ignition coils, fuel pumps, or clogged fuel lines can all cause poor combustion of the engine's air-fuel mixture. Poor combustion leads to engine carbon buildup or knocking issues. When the engine's oxygen sensor detects these problems and reports them to the ECU, the fault light will illuminate as a warning.