If the engine warning light is on, you can follow these steps: First, check if the engine is running normally, whether there is shaking, black smoke, or difficulty starting. If any of these issues are present, try not to start the engine again. Especially note that if the red light is on, do not start the engine at all. If the engine is running normally and the vehicle can be driven, please go to a service station as soon as possible to find out the cause. The service station only needs to connect a portable diagnostic device to easily read the fault code, obtain fault information, and carry out targeted repairs. If the engine is running normally, the owner can also try gently plugging in various wiring harness connectors, as it may be caused by a loose connection somewhere, or repeatedly turning the key to the ON position to see if the light can be eliminated. Generally, the reasons for the engine warning light being on mainly include the following seven: Sensor failure: The sensors mentioned here include water temperature, crankshaft position, air flow, intake temperature, oxygen sensors, etc. When these sensors are damaged, have poor contact, or the signal is interrupted, the vehicle's ECU cannot accurately obtain engine data, which will cause the engine warning light to come on. Fuel quality issue: If fuel and oil are not added as required by the manufacturer, it may cause engine wear, leading to the warning light coming on. Poor mixture combustion: Poor mixture combustion can cause engine carbon deposits or knocking. When monitored by the oxygen sensor and reported to the ECU, the warning light will come on as a warning. Spark plug failure, ignition coil failure, fuel pump failure, fuel line blockage, etc., can all cause poor mixture combustion in the engine. Turbocharging issue: The intake turbocharging pipeline and turbocharger can also cause the engine warning light to come on. The most common is turbocharger damage, accompanied by symptoms such as oil leakage, high oil consumption, power loss, metal noise, and blue or black smoke from the exhaust pipe. Intake issue: If there is a problem with the car's intake, it may cause engine pipeline blockage, and in severe cases, the engine warning light will come on. If the air filter is not clean and not cleaned regularly, it can lead to intake problems. Exhaust issue: Exhaust faults can also cause the engine warning light to come on. The rear oxygen sensor, three-way catalytic converter, exhaust camshaft, and bearing faults are all causes of exhaust problems, with the three-way catalytic converter being the most common. Using leaded gasoline, lead or silicon-containing lubricant additives, physical damage to the three-way catalytic converter, or engine fuel supply system failures can easily cause three-way catalytic converter faults. Anti-theft system fault: If the car's electronic anti-theft system malfunctions, or if the anti-theft controller does not match the engine electronic controller, the anti-theft system can also cause the engine to not work properly, and the engine warning light will come on.
