What are the reasons for the engine fault light in the Baojun 730?
2 Answers
The main reasons for the engine fault light to illuminate include sensor issues, engine misfire, car maintenance problems, fuel quality issues, poor combustion of the air-fuel mixture, engine intake problems, turbocharging problems, exhaust problems, and anti-theft system malfunctions. In addition, when the car is started, the vehicle performs a self-check on the engine system. Normally, the engine fault light will turn off after the self-check is completed. If it remains on for a long time, you should promptly visit a repair station to seek professional help and eliminate potential safety hazards. Below is a detailed explanation of each type of fault: Sensor Issues: Sensors include coolant temperature, crankshaft position, air flow, intake temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or experience signal interruptions, the car's ECU cannot accurately obtain engine data, which will cause the engine fault light to illuminate. Solution: If such issues occur, promptly visit a repair center for professional inspection and elimination of safety hazards. Maintenance Issues: Poor engine maintenance is the most common cause of the engine fault light illuminating. Vehicles have specific maintenance cycles. If maintenance is not performed on schedule and coupled with poor driving habits, the engine's operational burden will increase, ultimately causing the engine fault light to illuminate as a warning to the owner. Solution: Follow the time or mileage specified in your car's maintenance manual to perform comprehensive maintenance on the vehicle and eliminate non-maintenance-related issues. Fuel Quality Issues: This refers to both fuel and engine oil. The fuel added to the car usually has a specific grade, and engine oil can be semi-synthetic or fully synthetic. Manufacturers generally recommend which fuel grade and oil type to use. If the owner does not follow these recommendations, long-term use can cause engine wear, leading to the fault light illuminating. Solution: Use the appropriate fuel grade and engine oil as specified for the vehicle. Poor Combustion of Air-Fuel Mixture: Faults in the engine's spark plugs, fuel pump, or clogged fuel lines can cause poor combustion of the air-fuel mixture. This leads to engine carbon buildup or knocking issues, which are detected by the engine's oxygen sensors and reported to the ECU, triggering the fault light as a warning. Solution: Regularly inspect and replace spark plugs, clean engine carbon deposits, and perform engine maintenance as per the maintenance manual. Intake Issues: During engine combustion, intake air is required, and the air filter plays a crucial role. If the car's air filter is dirty or not cleaned regularly, it can affect the intake system, potentially leading to blockages and, in severe cases, causing the engine fault light to illuminate. Solution: Regularly clean or replace the car's air filter to ensure the proper functioning of the intake system. Turbocharging Issues: Problems with the intake boost pipes or turbocharger can also cause the engine fault light to illuminate. The most common issue is turbocharger damage, accompanied by symptoms such as oil leaks, excessive oil consumption, reduced power, metal noises, or blue/black smoke from the exhaust. Solution: Visit a 4S shop to inspect and replace the turbocharger. In most cases, repairing such issues is not cost-effective, and replacing the component is the better option. Exhaust Issues: These include the rear oxygen sensor, catalytic converter, exhaust camshaft, and bearings. The most common issue is catalytic converter failure, which causes the engine fault light to illuminate. Physical damage to the catalytic converter or fuel system malfunctions can easily lead to catalytic converter issues. Solution: Use lead- or silicon-based lubricants to maintain and clean the catalytic converter. Anti-Theft System: If the car's electronic anti-theft system malfunctions or if the anti-theft controller does not match the engine's electronic controller, the anti-theft system can prevent the engine from operating normally, causing the engine fault light to illuminate. Solution: Visit a professional repair shop for a systematic inspection, as this cannot be fixed by individuals. Engine Misfire: This refers to a fault where one or more cylinders in the engine do not work or work poorly. Engine misfire can lead to symptoms such as reduced power, difficulty starting, and unstable idling. Solution: First, identify which cylinder's components are damaged and replace them. If the issue involves internal mechanical damage, visit a repair shop for further inspection.
My Baojun 730 was driving on the road when the engine fault light suddenly came on, which made me quite worried. Usually, this kind of situation might be due to a sensor problem, such as a faulty oxygen sensor, which causes the computer to misjudge the exhaust as too dirty; or it could be a clogged fuel line, where impurities accidentally got mixed in when refueling. Sometimes, the ignition system has issues, with the spark plugs not firing properly, leading to engine shaking. There’s also a possibility that the catalytic converter is clogged, affecting exhaust emissions. Last year, I encountered a similar situation—I kept driving with the light on, and as a result, fuel consumption skyrocketed, and the car’s power weakened. Later, when I took it to the repair shop, they found out a small module was broken, and it cost me a few hundred bucks to fix. My advice is to stop driving as soon as the light comes on and get a professional diagnosis to avoid making the problem worse and damaging the engine. Always refuel at reputable gas stations and don’t go for the cheap options.
