What are the reasons why Jetta is difficult to start in the morning?

[VonBrady]

Jetta may be difficult to start in the morning due to reasons such as a depleted battery, high viscosity of engine oil, or spark plug carbon buildup. The specific causes and solutions are as follows: Depleted battery: When the battery is depleted or has insufficient charge, the engine cranking speed will be weak, abnormal noises may occur, and the car will be difficult to start. The solution is to recharge the battery. Spark plug carbon buildup: After several years of use, spark plugs are prone to issues such as carbon buildup, leakage, excessive gap, or erosion, which can make it difficult to start the car, whether cold or even warm. Multiple ignition attempts are often required. The solution is to clean the spark plugs.