What causes the idle vibration in an Audi A6?

[CadenLee]

Possible causes include unstable oil pressure, severe carbon buildup, ignition system issues, aging engine components, faulty spark plugs, or air intake system leaks. Below is relevant information: 1. Unstable oil pressure: Abnormal fuel pump pressure or incorrect readings from the intake pressure sensor can cause vehicle vibration. Owners should check oil pressure and replace components if necessary. 2. Severe engine carbon buildup: After driving a certain mileage, a dirty throttle body may fail to close properly or cause motor stalling, leading to high idle speed. Carbon deposits accumulated during this process result in vehicle vibration, especially during startup when the engine shakes more noticeably than usual. Timely carbon cleaning is essential.