The engine malfunction indicator light in the Excelle 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 malfunction light. Fuel/oil quality issues: Failure to use fuel and engine oil as specified by the manufacturer may cause engine wear, leading to the warning light activation. Poor fuel mixture combustion: Incomplete combustion can cause engine carbon buildup or knocking. When detected by oxygen sensors and reported to the ECU, the malfunction light will illuminate. Contributing factors include spark plug failure, ignition coil issues, fuel pump malfunction, or fuel line blockage. Turbocharging problems: Issues with the intake boost piping or turbocharger can trigger the light. The most common is turbocharger damage, often accompanied by oil leaks, excessive oil consumption, power loss, metallic noises, or blue/black exhaust smoke. Intake system issues: Air intake problems may lead to engine pipe blockages, potentially triggering the warning light. A dirty air filter that hasn't been regularly cleaned can cause intake issues. Exhaust system faults: Exhaust problems may also activate the light, commonly caused by rear oxygen sensor failure, catalytic converter issues, or exhaust camshaft/bearing problems. Using leaded gasoline, lead/silicon-containing lubricant additives, physical damage to the catalytic converter, or fuel system failures can all contribute. Anti-theft system malfunction: If the electronic anti-theft system fails or the immobilizer doesn't match the engine ECU, it may prevent normal engine operation while illuminating the warning light. When the engine malfunction light appears, follow these steps: First observe whether the engine operates normally - check for vibrations, black smoke, etc. If present, avoid restarting the engine. Note: Never restart if the red warning light is on. If the engine starts normally, turn it off for 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 perform a self-check - observe whether the warning light turns off after 5-10 seconds. If the light remains on, visit a service center immediately. Technicians can use diagnostic tools to read trouble codes and perform targeted repairs.
