What is the reason why the car won't start with the lights on?

The reasons why the car can't start with ignition are that the throttle or idle motor is damaged, the gasoline pump is damaged, the ignition coil is damaged, and the water temperature sensor is damaged. Failure to catch fire is one of the most common faults of cars. The throttle or idle motor is damaged. The air during ignition can only enter from the reserved gap of throttle or idle motor. Because the throttle or idle motor is damaged, the air intake cannot be adjusted, so the air-fuel ratio is incorrect, which leads to the failure to start the ignition. The gasoline pump is damaged. The gasoline pump is broken. Without gasoline entering the cylinder, it can't be started and can't work normally. To check whether the gasoline pump is damaged, just press the oil pressure inspection port on the gasoline track to see whether the gasoline is ejected or connect the gasoline pressure gauge to check the oil pressure. The ignition coil is damaged. Refers to the integral ignition coil. After the damage, each cylinder can't be ignited, so it can't be started by ignition. Crankshaft position sensor is damaged. If the crankshaft position sensor is damaged and the rotation of the crankshaft cannot be detected, the ignition cannot be started. The water temperature sensor is damaged. If the water temperature sensor is damaged, the engine will increase the fuel injection during ignition, making the mixture too rich to start ignition. When the car can't start, it needs professional maintenance personnel to check and repair and replace the corresponding damaged parts.