What is the reason for the BMW X1 stalling when shifting to P gear and opening the door?

[VonElena]

It may be due to the spark plugs losing their ignition capability. Engine carbon deposits: Carbon deposits can cause incomplete combustion of gasoline, leading to engine shaking. The impact of engine carbon deposits on a car is significant. Firstly, it reduces engine power, resulting in uneven power output and gradual attenuation—in other words, the car becomes increasingly sluggish. Secondly, it increases fuel consumption, adding to the economic burden. Cold start difficulties: This means difficulty in starting the engine, making it hard to get the car running. In severe cases, carbon deposits in the combustion chamber can cause cylinder knocking, produce noise during low-speed acceleration, damage the pistons and crankshaft, and lead to engine overheating, severely compromising vehicle safety. Additionally, it results in excessive emissions, not only failing annual inspections but also significantly worsening environmental pollution.