Why does the engine malfunction indicator light come on every few days?

[JoshuaLynn]

The engine malfunction indicator light coming on every few days suggests it may be an intermittent fault, possibly due to poor sensor contact or an intermittent issue. It is recommended to use an automotive diagnostic scanner to check the engine system. In many cases, the cause is substandard fuel quality, which affects the incomplete combustion of the engine's air-fuel mixture. Below is an introduction to issues with the car's warning lights: 1. The engine malfunction indicator light comes on and then goes off: In many cases, this is due to substandard fuel quality affecting the incomplete combustion of the engine's air-fuel mixture. You can add some high-quality fuel additives or choose a gas station with better fuel quality. 2. The exhaust emission warning light stays on continuously: A diagnostic tool is needed to identify the fault codes stored in the engine. Based on the fault codes and the data status of the engine's oxygen sensors and other systems, further troubleshooting can be conducted. This is because any issues with components related to the air-fuel mixture combustion in the engine can generally trigger the exhaust emission warning light.