What are the reasons why a Mondeo won't start?

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Mondeo won't start for the following reasons: 1. Check if the battery voltage is too low: You can turn on the headlights and some electrical devices to observe whether there is any noticeable dimming of the dashboard and interior lighting during the starting process. If dimming is confirmed, it indicates insufficient battery voltage. 2. Excessive carbon buildup in the intake manifold: Excessive carbon deposits on components like the throttle body and idle control valve can prevent the engine from achieving the required air-fuel mixture ratio, resulting in 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 mixture ratio, leading to the vehicle's failure to start.