What causes the yellow engine fault light to illuminate in the Qoros 5?

[MacDante]

The following are the specific reasons for the yellow engine fault light illuminating in the Qoros 5: 1. Abnormal fuel pressure: If the fuel pump's supply pressure does not reach a certain level, it will result in poor atomization of the fuel injector, thereby affecting the normal operation of the engine. Normally, the fuel pump pressure should be between 2.5—3.5 MPA. If the fuel pump pressure exceeds 3.5 MPA, after the injector operates, the injector spring may struggle to overcome the fuel pressure, leading to continuous fuel injection and excessively rich exhaust emissions. 2. Engine knocking or detonation: The engine is equipped with a dedicated knock sensor to monitor engine knocking. Engine knocking can potentially cause severe mechanical damage or significant power loss. Typically, knocking is categorized into noticeable and unnoticeable knocking. In the case of unnoticeable knocking, the engine control unit (ECU) will adjust the engine control parameters based on the monitored situation to prevent further adverse effects. However, when the unnoticeable knocking exceeds the adjustable range of the ECU, the engine fault light will also illuminate as a warning.