Why does the malfunction indicator light come on after refueling?

[FernandoAnn]

After refueling, if the engine malfunction indicator light comes on, it is generally caused by fuel-related issues. Poor fuel quality can lead to the oxygen sensor reporting a fault after combustion in the engine. It is recommended to visit a 4S shop for a detailed inspection to avoid affecting vehicle performance. Below are relevant explanations: 1. Reasons for the malfunction indicator light: There are many reasons why the engine malfunction indicator light may come on, such as a fault in the purge solenoid valve controlling fuel vapor emissions, a malfunctioning air flow meter, faulty ignition coils, a thermostat issue, engine problems, a faulty three-way catalytic converter, oxygen sensor failure, or excessive carbon buildup on the electronic throttle. 2. How to handle the malfunction indicator light: When the engine malfunction indicator light comes on, you can first observe the situation yourself. If it is a major fault, it may be accompanied by symptoms such as loss of engine power, severe shaking, rising water temperature, and multiple warning lights on the dashboard. In such cases, it is necessary to stop the vehicle and wait for professional assistance.