What should I do if the engine warning light is on in a Livina?

[JoyMarie]

If the engine warning light is on, you can follow these steps: First, check if the engine is running normally. Look for issues such as shaking, black smoke, or difficulty starting. If any of these problems are present, avoid restarting the engine. Note: If the red warning light is on, do not restart the engine under any circumstances. If the engine is running normally and the car can be driven, visit a service station as soon as possible to diagnose the issue. The service station 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 all wiring harness connectors, as a loose connection might be the cause. Alternatively, repeatedly turning the key to the ON position may reset the warning light. Generally, the engine warning light may illuminate due to the following seven reasons: Sensor failure: This includes sensors such as the coolant temperature sensor, crankshaft position sensor, air flow sensor, intake temperature sensor, and oxygen sensor. If these sensors are damaged, poorly connected, or their signals are interrupted, the car's ECU cannot accurately obtain engine data, triggering the warning light. Fuel or oil quality issues: If fuel or engine oil is not added according to the manufacturer's specifications, it may cause engine wear and trigger the warning light. Poor combustion of the air-fuel mixture: Poor combustion can lead to engine carbon buildup or knocking. When detected by the oxygen sensor and reported to the ECU, the warning light will illuminate. Issues such as faulty spark plugs, ignition coils, fuel pumps, or clogged fuel lines can cause poor combustion. Turbocharger issues: Problems with the intake boost system or turbocharger can also trigger the warning light. The most common issue is a damaged turbocharger, often accompanied by symptoms such as oil leaks, excessive oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Intake issues: If the car's intake system is compromised, it may lead to clogged engine passages, potentially triggering the warning light. A dirty or uncleaned air filter can cause intake problems. Exhaust issues: Exhaust system faults can also cause the warning 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 due to the use of leaded gasoline, lead- or silicon-containing lubricant additives, physical damage, or fuel system issues. Anti-theft system malfunction: If the car's electronic anti-theft system fails or the anti-theft controller does not match the engine's electronic controller, the anti-theft system may prevent the engine from operating normally, triggering the warning light.