Reasons for the Engine Warning Light in Qoros 5

[MacEmilio]

The engine warning light in Qoros 5 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/oil quality issues: Failure to use the fuel and engine oil as specified by the manufacturer may cause engine wear, leading to the warning light activation. Poor combustion of 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 caution. Issues like spark plug failure, ignition coil malfunction, fuel pump failure, or fuel line blockage can all cause poor combustion. Turbocharging problems: Intake turbocharging pipelines or turbocharger issues can also trigger the engine warning light. 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. Intake problems: If the vehicle's intake system malfunctions, it may lead to engine pipeline blockages, and in severe cases, trigger the engine warning light. A dirty air filter that hasn't been cleaned regularly can cause intake issues. Exhaust problems: Exhaust system faults can also activate the engine warning light. Common causes include rear oxygen sensor failure, three-way catalytic converter issues, exhaust camshaft and bearing failures. The three-way catalytic converter is most frequently affected. Using leaded gasoline, lead/silicon-based lubricant additives, physical damage to the catalytic converter, or fuel system malfunctions can all contribute to catalytic converter failure. Anti-theft system malfunction: If the electronic anti-theft system fails or there's a mismatch between the anti-theft controller and engine ECU, the anti-theft system may prevent normal engine operation while illuminating the warning light. When the engine warning light illuminates, follow these steps: First, check if the engine is running normally. Look for symptoms like shaking or black smoke emission. If present, avoid restarting the engine. Note: Never restart if the red warning light is on. If the engine can be started, turn it off and wait 5-10 minutes. Without pressing the brake pedal, press the start button once or turn the key halfway to the ON position (without depressing the clutch). The vehicle will initiate self-diagnosis upon power-on. After 5-10 seconds, observe whether the warning light turns off. If the light remains on, visit a service center promptly. Technicians can use portable diagnostic tools to read fault codes, identify issues, and perform targeted repairs.