What are the reasons for the engine warning light in the Baojun 730?
2 Answers
Sensor issues, car maintenance problems, fuel quality issues, poor combustion of the air-fuel mixture, engine intake problems, turbocharging issues, exhaust problems, and anti-theft system malfunctions are the main reasons that cause the engine warning light to illuminate. Additionally, during vehicle startup, the car performs a self-check on the engine system. Normally, the engine warning light will turn off after the self-check is completed. If it remains on for an extended period, you should promptly visit a repair station to seek professional assistance for inspection and to eliminate potential safety hazards. Below is a detailed explanation of each type of fault: Sensor problems: Sensors include those for coolant temperature, crankshaft position, air flow, intake temperature, oxygen levels, etc. When these sensors are damaged, have poor contact, or experience signal interruptions, the car's ECU cannot accurately obtain engine data, which triggers the engine warning light. In such cases, it is advisable to visit a repair center promptly for professional inspection and to eliminate safety risks. Maintenance issues: Poor engine maintenance is the most common cause of the engine warning light illuminating. Vehicles have specific maintenance cycles. If maintenance is not performed on schedule, combined with poor driving habits, it can increase the burden on the engine, eventually causing the engine warning light to illuminate as a reminder of a fault. Fuel quality issues: This refers to both fuel and engine oil. The fuel used in cars usually has a specific grade, and engine oil can be semi-synthetic or fully synthetic. Manufacturers typically recommend which fuel grade and oil type to use. If the owner fails to follow these recommendations, prolonged use can lead to engine wear, triggering the warning light. It is essential to use the correct fuel grade and suitable engine oil as specified for the vehicle. Poor combustion of the air-fuel mixture: Faults in the spark plugs, ignition coils, fuel pump, or clogged fuel lines can lead to poor combustion of the air-fuel mixture in the engine. This results in engine carbon buildup or knocking, which is detected by the oxygen sensors and reported to the ECU, causing the warning light to illuminate as a warning. Intake problems: The engine requires air intake during combustion, making the air filter crucial. If the air filter is dirty or not cleaned regularly, it can affect the engine's air intake, potentially leading to blockages over time. In severe cases, this can cause the engine warning light to illuminate. Turbocharging issues: Problems with the intake turbocharging pipes or the turbocharger itself can also cause the engine warning light to illuminate. The most common issue is turbocharger damage, often accompanied by symptoms such as oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Exhaust problems: These include issues with the rear oxygen sensor, catalytic converter, exhaust camshaft, and bearings. The most common cause is a faulty catalytic converter, which triggers the engine warning light. Factors such as using leaded gasoline, lead- or silicon-based oil additives, physical damage to the catalytic converter, or fuel system faults can easily lead to catalytic converter failures.
My Baojun 730's engine light came on before, which made me a bit nervous, so I called a friend for advice. He said it might be an issue with the oxygen sensor. My car is over five years old, and I don't drive much on highways, so it's likely a false alarm caused by sensor aging or poor fuel quality. Later, I checked the fuel tank cap myself and found it wasn't tightened properly. After tightening it, the light was still on. So, I went to a nearby repair shop, and they used a diagnostic tool to read the fault code—it turned out the air flow meter had an error. After replacing it with a new part, the issue was resolved. Actually, there are many possible causes, such as worn spark plugs, broken ignition coils, or a clogged catalytic converter, all of which can trigger the light. If not addressed promptly, fuel consumption can skyrocket, and it might even damage the engine. My advice is not to delay—drive gently without sudden acceleration and get the code scanned as soon as possible to fix the root problem.
