What does the faucet-like light in a car indicate as a fault?

[SanBrandon]

The faucet-like light in a car is the engine fault light. Generally, when the engine fault light is on, it indicates a problem with the car's engine or surrounding components. Below are the reasons why the engine fault light may illuminate: 1. Poor fuel quality: Most car owners have experienced this—shortly after refueling, the engine fault light on the dashboard comes on. This is usually due to filling up at an unregulated gas station with poor-quality fuel, causing incomplete combustion of the air-fuel mixture during engine operation and triggering the engine fault light. This does not affect driving safety but may harm the engine to some extent. 2. Oxygen sensor failure: Cars are equipped with two oxygen sensors, one before and one after the three-way catalytic converter. The front oxygen sensor detects the air-fuel ratio under different engine conditions, and the ECU adjusts the fuel injection amount and calculates the ignition timing based on this signal.