If the engine malfunction 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. Note: Never restart the engine if the red light is on. If the engine can be started, turn it off and wait for 5-10 minutes. Without pressing the brake, press the start button once or turn the key halfway to the 'on' position without depressing the clutch. The vehicle will perform a self-check after powering on. Wait for 5-10 seconds and observe whether the malfunction light on the dashboard turns off. If the light remains on, visit a service center as soon as possible. The service center can use a portable diagnostic tool to read the fault code, identify the issue, and perform targeted repairs. There are seven main reasons why the engine malfunction light may illuminate: Sensor malfunction: This includes sensors such as coolant temperature, crankshaft position, air flow, intake temperature, and oxygen sensors. Damage, poor contact, or signal interruption in these sensors can prevent the ECU from accurately obtaining engine data, triggering the malfunction light. Fuel or oil quality issues: Using fuel or oil that does not meet the manufacturer's specifications may cause engine wear, leading to the malfunction light. Poor combustion of the air-fuel mixture: This can result in engine carbon buildup or knocking. When detected by the oxygen sensor and reported to the ECU, the malfunction light will illuminate as a warning. Causes include faulty spark plugs, ignition coils, fuel pumps, or clogged fuel lines. Turbocharger issues: Problems with the intake boost system or turbocharger can trigger the malfunction light. The most common issue is a damaged turbocharger, often accompanied by oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Intake problems: Clogged engine intake passages can cause the malfunction light to illuminate. A dirty air filter that hasn't been cleaned regularly can lead to intake issues. Exhaust problems: Exhaust system faults, such as faulty rear oxygen sensors, catalytic converters, exhaust camshafts, or bearings, can trigger the malfunction light. The catalytic converter is the most common culprit, often damaged by leaded gasoline, improper lubricant additives, physical impact, or fuel system issues. Anti-theft system malfunction: If the vehicle's electronic anti-theft system fails or the anti-theft controller is incompatible with the engine ECU, the engine may not function properly, and the malfunction light will illuminate.
