What are the reasons for the engine warning light in Maxus V80?

[JackMarie]

The engine warning light 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 connections, or experience signal interruptions, the vehicle's ECU cannot accurately obtain engine data, triggering the engine warning light. Fuel quality issues: Failure to use the fuel and engine oil as recommended by the manufacturer may cause engine wear, leading to the illumination of the warning light. Poor combustion of air-fuel mixture: This 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. Causes include spark plug failure, ignition coil failure, fuel pump failure, and fuel line blockage. Turbocharging issues: Problems with the intake boost piping or turbocharger can also trigger the engine warning light. The most common issue is turbocharger damage, accompanied by symptoms such as oil leaks, high oil consumption, reduced power, metallic noises, and blue or black smoke from the exhaust. Intake problems: Blockages in the engine intake system can lead to the illumination of the warning light. A dirty or uncleaned air filter can cause intake issues. Exhaust problems: Exhaust system faults, including issues with the rear oxygen sensor, catalytic converter, exhaust camshaft, and bearings, can trigger the warning light. The catalytic converter is the most common culprit, often affected by the use of leaded gasoline or lubricant additives containing lead or silicon, physical damage to the converter, or fuel system malfunctions. Anti-theft system malfunction: If the vehicle's electronic anti-theft system fails or if there's a mismatch between the anti-theft controller and the engine ECU, the engine may not operate normally, and the warning light will illuminate. If the engine warning light comes on, follow these steps: First, check if the engine is running normally. Look for symptoms such as shaking or black smoke. If present, avoid restarting the engine. Particularly, do not restart if the light is red. 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 upon powering up. After 5-10 seconds, observe if the warning light turns off. If the light remains on, visit a service station as soon as possible. Technicians can use a portable diagnostic tool to read fault codes, identify the issue, and perform targeted repairs.