If the engine warning light is on, you can follow these steps: First, check whether the engine is running normally, whether there is shaking, black smoke, or difficulty starting, etc. If there is, try not to start it again. It is especially important to note that if the red light is on, do not start the engine again. If the engine is running normally and the car 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 tool 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 each wiring harness connector, as it may be caused by a loose connection somewhere, or repeatedly turning the key to the ON position to see if it can be eliminated. Generally speaking, 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 sensor, etc. When these sensors are damaged, have poor contact, or the signal is interrupted, the car's ECU cannot accurately obtain engine data, which will cause the engine warning light to come on. Oil quality issues: If fuel and engine oil are not added according to the manufacturer's requirements, it may cause engine wear and lead to the warning light coming on. Poor combustion of the mixture: Poor combustion of the mixture will cause engine carbon deposits or knocking. After being detected 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, and fuel line blockage can all cause poor combustion of the engine mixture. Turbocharging issues: Intake turbocharging pipelines and turbochargers can also cause the engine warning light to come on. The most common of these is turbocharger damage, and the vehicle will also show symptoms such as oil leakage, high oil consumption, reduced power, metal noise, and blue or black smoke from the exhaust pipe. Intake issues: If there is a problem with the car's intake, it may cause the engine pipeline to become blocked, and in severe cases, the engine warning light will come on. If the air filter is not clean and not cleaned regularly, it will cause intake problems. Exhaust issues: Exhaust faults can also cause the engine warning light to come on. Rear oxygen sensor, three-way catalytic converter, exhaust camshaft and bearing failure are all causes of exhaust problems, with the three-way catalytic converter being the most common. The use of leaded gasoline, the use of lead or silicon lubricant additives, damage to the three-way catalytic converter, and engine fuel supply system failures can easily cause three-way catalytic converter failure. Anti-theft system failure: If the car's electronic anti-theft system fails, or if the anti-theft controller does not match the engine electronic controller, the anti-theft system will also cause the engine to not work properly, and the engine warning light will come on.
