There are mainly 7 reasons for the engine malfunction indicator light to come on: 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 signal interruption, the vehicle's ECU cannot accurately obtain engine data, which will cause the engine malfunction indicator light to come on. Fuel 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 malfunction light coming on. Poor mixture combustion: Poor mixture combustion can cause engine carbon deposits or knocking. When detected by the oxygen sensor and reported to the ECU, the malfunction light will come on as a warning. Spark plug failure, ignition coil failure, fuel pump failure, fuel line blockage, etc., can all cause poor engine mixture combustion. Turbocharging issues: Intake turbocharging pipelines and turbochargers can also cause the engine malfunction light to come on. The most common issue is turbocharger damage, accompanied by symptoms such as oil leakage, high oil consumption, reduced power, metal noises, blue or black smoke from the exhaust pipe. Intake issues: If the vehicle's intake system has problems, it may cause engine pipeline blockage, and in severe cases, the engine malfunction light will come on. If the air filter is not clean and not regularly cleaned, it can lead to intake problems. Exhaust issues: Exhaust faults can also cause the engine malfunction 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 catalytic converter, or engine fuel supply system faults can easily cause three-way catalytic converter failure. Anti-theft system failure: If the vehicle'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 malfunction, and the engine malfunction light will come on. If the engine malfunction light comes on, follow these steps: First, check if the engine is running normally, whether there is shaking, black smoke, etc. If so, try not to start the engine again. Especially note, do not start the engine if the red light is on. If the engine can be started, turn it off for 5-10 minutes, then without pressing the brake, press the start button once, or without pressing the clutch, turn the key halfway to the 'on' position. The vehicle will perform a self-check after powering on. Wait for 5-10 seconds to see if the malfunction light on the dashboard goes off. If the malfunction light does not go off, please go to a service station as soon as possible to find out the reason. The service station can use a portable diagnostic tool to read the fault code, obtain fault information, and perform targeted repairs.
