What causes the yellow engine fault light to illuminate in the Qoros 5?
2 Answers
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.
As a veteran driver who has owned the Qoros 5 for many years, I've encountered the engine malfunction light coming on several times, mostly for minor reasons. The most common issue is sensor problems, such as carbon buildup on the oxygen sensor causing abnormal emission data; or minor glitches like a loose fuel cap allowing air leakage that triggers the warning light. Sometimes it's a fuel system malfunction, where clogged fuel injectors affect the combustion efficiency of the air-fuel mixture. This light indicates the ECU has detected a potential issue, but the car is still drivable—don't take it lightly, as it could lead to bigger problems, like catalytic converter damage which is extremely costly to repair. My advice is to first pull over and check the basics, like sniffing for gasoline odors, then turn off and restart the engine to see if the light stays on; if not, head to a 4S shop to scan for trouble codes with a diagnostic tool for precise identification. Regular maintenance like changing air filters and spark plugs can prevent many headaches—safety first when driving!
