What Causes the Warning Light to Keep Coming On?

[StCatherine]

Possible reasons for the car warning light to illuminate are as follows: 1. Abnormal engine oxygen sensor: There are many situations where the engine warning light is triggered by an abnormal oxygen sensor. The 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 warning light. 2. Clogged fuel injectors and carbon buildup on intake valves: These can also cause the engine warning light to activate. Impurities in gasoline can accumulate at the fuel injector, affecting fuel spray, especially in direct-injection engines, which can directly lead to engine shutdown. After combustion, these impurities form carbon deposits, which, when accumulated on the throttle valve, can interfere with its normal operation, affecting engine performance and causing the warning light to illuminate. 3. Another common issue is sensor malfunction. For example, after driving on a muddy road, the engine warning light may suddenly come on, even though the car shows no other abnormalities. A sensor anomaly doesn't necessarily indicate a vehicle fault, but it does signal an issue that requires attention.