What are the reasons for the engine warning light in the Changan CS35?

[VioletLee]

The engine warning light in the Changan CS35 may illuminate due to the following 7 main reasons: Sensor malfunction: This includes sensors such as coolant temperature, crankshaft position, air flow, intake temperature, and oxygen sensors. When these sensors are damaged, have poor contact, or experience signal interruption, the vehicle's ECU cannot accurately obtain engine data, triggering the engine warning light. Fuel or oil quality issues: Failure to use the fuel or engine oil as specified by the manufacturer may cause engine wear, leading to the illumination of the warning light. Poor combustion of the air-fuel mixture: Poor combustion can result in engine carbon buildup or knocking. When detected by the oxygen sensor and reported to the ECU, the warning light will illuminate as a warning. Issues such as faulty spark plugs, ignition coils, fuel pump failures, or clogged fuel lines can cause poor combustion. Turbocharging problems: Issues with the intake boost piping or turbocharger can also trigger the engine warning light. The most common issue is turbocharger damage, accompanied by symptoms such as oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Intake problems: If the vehicle's intake system is compromised, it may lead to clogged engine pipes, and in severe cases, the engine warning light will illuminate. A dirty or uncleaned air filter can cause intake problems. Exhaust problems: Exhaust system faults can also trigger the engine warning light. Common causes include faulty rear oxygen sensors, catalytic converter issues, or problems with the exhaust camshaft and bearings. The catalytic converter is the most frequent culprit, often due to the use of leaded gasoline, lead/silicon-based lubricant additives, physical damage, or fuel system malfunctions. Anti-theft system malfunction: If the vehicle's electronic anti-theft system fails or the anti-theft controller does not match the engine ECU, the anti-theft system may prevent the engine from operating normally, accompanied by the illumination of the engine warning light. If the engine warning light illuminates, follow these steps: First, check whether the engine is running normally. If there are issues such as shaking or black smoke, avoid restarting the engine. Note: Do not restart the engine if the red warning light is on. If the engine can be started, turn it off and wait for 5-10 minutes. Without pressing the brake pedal, press the start button once or turn the key halfway to the "ON" position (without pressing the clutch). The vehicle will enter self-check mode. Wait for 5-10 seconds and observe whether the warning light turns off. If the warning light remains on, visit a service center as soon as possible. Technicians can use a diagnostic tool to read the fault code, identify the issue, and perform targeted repairs.