If the engine warning light comes on, you can follow these steps to address the issue: First, check whether the engine is running normally. Look for signs such as shaking, black smoke, or difficulty starting. If any of these issues are present, avoid restarting the engine. Note: If the light is red, do not attempt to restart the engine under any circumstances. If the engine is running normally and the vehicle can still be driven, visit a service center as soon as possible to diagnose the problem. A service center can easily read the fault codes using a portable diagnostic tool, allowing for targeted repairs based on the fault information. If the engine is running normally, the owner can also try gently reconnecting various wiring harness connectors, as a loose connection may be the cause. Alternatively, repeatedly turning the key to the ON position may reset the light. Generally, the engine warning light may come on due to the following seven reasons: Sensor malfunction: This includes sensors such as the coolant temperature sensor, crankshaft position sensor, air flow sensor, intake air temperature sensor, and oxygen sensor. If these sensors are damaged, have poor connections, or lose signal transmission, the vehicle's ECU cannot accurately obtain engine data, triggering the warning light. Fuel or oil quality issues: Failure to use the fuel or engine oil recommended by the manufacturer may lead to engine wear, causing the warning light to illuminate. 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 warning light will activate. Common 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 engine warning light. The most common issue is turbocharger failure, often accompanied by oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Air intake issues: Blockages in the engine's air intake system can lead to the warning light turning on. A dirty or uncleaned air filter is a frequent cause. Exhaust system issues: Faults in the exhaust system, such as a malfunctioning rear oxygen sensor, catalytic converter, exhaust camshaft, or bearings, can trigger the warning light. The catalytic converter is particularly prone to damage from leaded gasoline, improper oil additives, physical impact, or fuel system issues. Anti-theft system malfunction: If the vehicle's electronic anti-theft system fails or the immobilizer and engine control unit are mismatched, the engine may not operate correctly, and the warning light will illuminate.
