What are the reasons for a Toyota Corolla suddenly failing to start?

[DiEvangeline]

The reasons for the car not starting are as follows: 1. Low battery voltage: You can turn on the headlights and some electrical devices to check if there are any noticeable changes in the brightness of the dashboard and interior lights during the starting process. If they dim, it indicates insufficient battery voltage. 2. Excessive carbon buildup in the intake manifold: Too much carbon buildup on components like the throttle body and idle control valve can prevent the engine from achieving the required air-fuel ratio, leading to the vehicle's inability to start. The repeated engagement of the solenoid and starter relay may produce a clicking sound. 3. Insufficient fuel supply in the fuel system: This issue is similar to excessive carbon buildup in the intake manifold, as it also prevents the engine from achieving the necessary air-fuel ratio, resulting in the vehicle's failure to start.