What are the reasons for the engine malfunction light in the Volkswagen Tharu?

[LaKatherine]

The engine malfunction light in the Tharu 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 quality issues: Failure to use the fuel and engine oil as specified by the manufacturer 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. Issues such as faulty spark plugs, ignition coils, fuel pump, or clogged fuel lines can cause poor combustion. Turbocharger problems: The intake boost pipe or turbocharger can also trigger the engine malfunction light. The most common issue is turbocharger damage, accompanied by symptoms like 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 cause engine pipe blockages, and in severe cases, trigger the malfunction light. A dirty or uncleaned air filter can lead to intake issues. Exhaust problems: Exhaust system faults can also cause the engine malfunction light to illuminate. Common causes include faulty rear oxygen sensors, catalytic converters, exhaust camshafts, or bearings. The catalytic converter is the most frequent culprit, often damaged by leaded gasoline, lead/silicon-based lubricant additives, physical impacts, or fuel system issues. 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 system may prevent the engine from operating normally, accompanied by the malfunction light. If the engine malfunction light illuminates, follow these steps: First, check if the engine is running normally. If there is shaking, black smoke, or other abnormalities, avoid restarting the engine. Note: Never restart if the red warning light is on. If the engine can start, turn it off and wait 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 upon powering up. Observe if the malfunction light turns off after 5-10 seconds. If the light remains on, visit a service center as soon as possible. Technicians can use a portable diagnostic tool to read fault codes, identify the issue, and perform targeted repairs.