What Causes the FAW Engine Malfunction Light to Illuminate?

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The engine malfunction light may illuminate due to the following 7 main reasons: Sensor failure: This refers to sensors including coolant temperature, crankshaft position, air flow, intake air temperature, and oxygen sensors. When these sensors are damaged, have poor connections, or experience signal interruptions, the vehicle's ECU cannot accurately obtain engine data, triggering the malfunction light. Fuel/oil quality issues: Failure to use the specified grade of fuel or engine oil as recommended by the manufacturer may cause engine wear, leading to the malfunction 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 as a warning. Contributing factors include faulty spark plugs, ignition coils, fuel pumps, or clogged fuel lines. Turbocharger 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 malfunction light. A dirty air filter that hasn't been regularly cleaned is a typical cause. Exhaust system faults: Problems like faulty rear oxygen sensors, catalytic converter failure, or exhaust camshaft/bearing issues can illuminate the light. The three-way catalytic converter is particularly vulnerable to damage from leaded gasoline, improper lubricant additives, physical impacts, or fuel system malfunctions. Anti-theft system malfunction: If the electronic anti-theft system fails or the immobilizer doesn't match with the engine ECU, the engine may not operate properly with the malfunction light activated. When the engine malfunction light illuminates, follow these steps: First check if the engine operates normally. If there's noticeable vibration, black smoke, etc., avoid restarting. Never restart if the red warning light is on. If the engine can start, turn off for 5-10 minutes. Without pressing the brake, press the start button once or turn the key halfway to ON position (without depressing clutch). The system will perform self-diagnosis for 5-10 seconds - observe if the warning light turns off. If the light persists, visit a service center immediately. Technicians can retrieve trouble codes using diagnostic tools to identify and repair the specific issue.