Why is the engine warning light on in the Hongqi H5?

[MarleyDella]

There are mainly 7 reasons why the engine warning light is on in the Hongqi H5: Sensor failure: The sensors mentioned here include water temperature, crankshaft position, air flow, intake temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or their signals are interrupted, the car's ECU cannot accurately obtain engine data, which will cause the engine warning light to come on. Fuel quality issues: If fuel and engine oil are not added according to the manufacturer's requirements, it may cause engine wear and trigger the warning light. Poor combustion of the air-fuel mixture: Poor combustion can lead to engine carbon deposits or knocking. When detected by the oxygen sensor and reported to the ECU, the warning light will illuminate as a warning. Spark plug failure, ignition coil failure, fuel pump failure, and fuel line blockage can all cause poor combustion of the air-fuel mixture. Turbocharging issues: The intake turbocharging pipeline and turbocharger can also cause the engine warning light to come on. The most common issue is turbocharger damage, accompanied by symptoms such as oil leaks, high oil consumption, reduced power, metallic noises, and blue or black smoke from the exhaust pipe. Intake issues: If there is a problem with the car's intake, it may lead to engine pipeline blockage, and in severe cases, the engine warning light will come on. A dirty air filter that is not cleaned regularly can cause intake problems. Exhaust issues: Exhaust faults can also trigger the engine warning light. The rear oxygen sensor, catalytic converter, exhaust camshaft, and bearing failures are all causes of exhaust problems, with the catalytic converter being the most common. Using leaded gasoline, lead or silicon-based lubricant additives, physical damage to the catalytic converter, or fuel system failures can easily cause catalytic converter issues. Anti-theft system failure: If the car's electronic anti-theft system malfunctions or the anti-theft controller does not match the engine electronic controller, the anti-theft system can prevent the engine from working properly, and the engine warning light will come on. If the engine warning light is on, follow these steps: First, check if the engine is running normally, whether there is shaking, black smoke, etc. If so, try not to start the engine again. Especially note that if the red light is on, do not start the engine. If the engine can be started, turn it off for 5-10 minutes, then without pressing the brake, press the start button once or turn the key halfway to the 'on' position without pressing the clutch. The car will enter self-check mode after powering on. Wait for 5-10 seconds and observe if the warning light on the dashboard goes off. If the warning light does not go off, visit a service station as soon as possible to find the cause. The service station can use a portable diagnostic tool to read the fault codes, obtain fault information, and perform targeted repairs.

[DelGavin]

I remember when the engine warning light came on, it was really a headache. For cars like the Hongqi H5, common causes are sensor issues, such as the oxygen sensor detecting excessive emissions, or the temperature sensor falsely reporting high coolant temperature, triggering the light. There could also be faults in the ignition system, like aging spark plugs causing poor ignition, which prompts the ECU to detect abnormalities and trigger an alert. Clogged fuel injectors or unstable pressure can disrupt the air-fuel mixture, also causing the light to come on. Don’t take it lightly—send it to the 4S shop immediately to read the fault codes with a diagnostic tool. I’ve personally experienced minor issues turning into major repairs due to neglect. Paying attention to coolant temperature and oil pressure changes during daily driving can help prevent problems in advance.