What is the reason for the starter clicking but not starting when turning the key?

[VonMelanie]

Use a household multimeter to measure whether the car battery voltage reaches 12V. If the measured voltage is less than 10V, the vehicle cannot be started, and the battery must be charged using a charger or jump-started with another battery. The following are the reasons and solutions for a car failing to start: 1. Use a multimeter to check if there is power at the starter's power supply terminal. If not, it indicates a power supply issue in the starting system, and the starter wiring needs to be checked for looseness, breakage, or aging. 2. If the starter is normal, the ignition system needs to be checked. It is possible that the spark plug's ignition end is contaminated with oil, and each spark plug should be removed and cleaned individually.