What Causes All the Car Warning Lights to Illuminate at Once?

[VonJayden]

There are 4 main reasons why all the car warning lights illuminate simultaneously: 1. ECU CAN bus failure or poor contact at the ECU CAN interface. The ECU needs replacement. 2. Excessive vehicle dirt and carbon deposits. This causes abnormal air circulation, preventing accurate control of normal air intake, leading to unstable gas content and poor engine performance. Carbon cleaning is required, along with inspection and replacement of related components. 3. Low fuel pressure. This results in poor system atomization, making the car difficult to start. Increasing fuel pressure before starting the vehicle can resolve this. 4. Vehicle startup self-check, which is a normal phenomenon. Simply starting the vehicle will suffice.