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What is the reason for the car not starting after leaving the headlights on for 20 minutes?

1 Answers

GageLynn

07/30/25 8:49am

The reasons why the car does not start after leaving the headlights on for 20 minutes are as follows: Insufficient battery voltage: When the battery voltage is insufficient, the horn and lights can still work, but the car may not start. Specific method to check the car battery voltage: Use a multimeter to test the battery voltage. If it is below 10V, consider replacing it; if it is around 11V, it can still be used temporarily, but prepare for replacement; if it is above 12V, it is usable. Check the quality of the gasoline and carbon deposits: If the car has been driven for about 20,000 km, focus on checking the throttle, ignition switch, starter, fuel pump, sensors, and other components related to the starting and fuel supply system. Starting too quickly: After turning on the power, do not start the car immediately. Wait for 30 seconds to 1 minute before attempting to start, and see if it makes any difference.

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