What is the reason for all the warning lights on the Audi A3 being on?

[LeKaden]

The reasons for all the warning lights on the Audi A3 being on are as follows: Bus fault: Modern car dashboards have various indicator lights or alarms under the mask. If all the warning lights are on, it is due to a CAN bus fault in the ECU or poor contact at the ECU's CAN interface. Excessive dirt: Too much dirt and carbon deposits can cause abnormal air circulation, making it impossible to accurately control the normal air intake, leading to unstable gas content and preventing the engine from working properly. Low fuel pressure: Low fuel pressure combined with poor constant pressure performance results in low system atomization levels, making the car difficult to start.