What are the reasons for the engine warning light in Haval F7?

[VanGabriela]

There are mainly 7 reasons for the engine warning light in Haval F7: 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 signal interruption, the car's ECU cannot accurately obtain engine data, which will cause the engine warning light to illuminate. 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 mixture combustion: Poor mixture 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 mixture combustion in the engine. Turbocharging issues: Intake turbocharging pipelines and turbochargers can also cause the engine warning light to illuminate. The most common issue is turbocharger damage, accompanied by symptoms such as oil leakage, high oil consumption, reduced power, metal noises, and blue or black smoke from the exhaust pipe. Intake issues: If there is a problem with the car's intake, it may cause engine pipeline blockage, and in severe cases, the engine warning light will illuminate. A dirty air filter that is not cleaned regularly can lead to intake problems. Exhaust issues: Exhaust faults can also cause the engine warning light to illuminate. 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 engine 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 also cause the engine to malfunction, and the engine warning light will illuminate. If the engine warning light is on, follow these steps: First, check if the engine is running normally and whether there are issues such as shaking or black smoke. If so, avoid restarting the engine. Especially note that if the red light is on, do not restart the engine. If the engine can start, 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 perform a self-check after powering on. Wait for 5-10 seconds and observe whether the warning light on the dashboard turns off. If the warning light does not turn off, visit a service station as soon as possible to diagnose the issue. The service station can use a portable diagnostic tool to read the fault code, obtain fault information, and perform targeted repairs.

[KingRose]

I just went to the 4S dealership a few days ago to deal with the same issue. The mechanic said the most common reasons for the engine light in a Haval F7 are fuel quality problems or severe carbon buildup. In my case, it was caused by filling up with low-quality gasoline from a small gas station—impurities in the fuel tank clogged the fuel injectors, leading to excessive exhaust emissions. However, the mechanic also warned that it could be due to a dirty oxygen sensor or aging spark plugs. If you notice reduced power or a sudden increase in fuel consumption, these are likely the culprits. Remember, never continue driving under these conditions—last time, my neighbor pushed it until black smoke appeared, which ended up burning out the catalytic converter, costing over 3,000 yuan to fix. The best course of action is to go to a professional shop and have them read the fault codes with a diagnostic tool. Trying to disassemble it yourself can easily damage the wiring.