What are the causes of car engine fault alarms?

[KimberlyRose]

Engine fault alarms can be caused by the following reasons: 1. Abnormal engine oxygen sensor triggering the fault light: The engine oxygen sensor is usually placed near the intake manifold. Aggressive driving or collisions can cause the sensor to shift or become damaged, leading to sensor abnormalities and triggering the fault light. 2. Clogged fuel injectors and carbon buildup on intake valves: Impurities in gasoline can accumulate at the fuel injectors, affecting fuel injection, especially in direct-injection engines, which can directly cause engine shutdown. These impurities, after combustion, produce carbon deposits. When accumulated to a certain extent on the throttle valve, they can interfere with its normal operation, affecting engine performance and causing the warning light to illuminate. 3. Sensor faults: Abnormal sensors do not necessarily indicate a vehicle fault, but they do signal unusual conditions that require attention.