What causes the throttle pressure drop in the Passat turbocharger?

[MacCarter]

Passat turbocharger throttle connection pressure drop is caused by damage to the exhaust one-way valve or air leakage in the boost pipe. The reasons for insufficient turbocharger pressure are as follows: 1. Insufficient pressure: The turbocharger's air filter is blocked, increasing suction loss and resulting in insufficient boost pressure. 2. Excessive oil deposits: Too much oil deposit in the internal air passage of the compressor part increases airflow resistance when passing through the passage with more oil deposits, leading to reduced boost pressure. 3. Poor combustion: Carbon deposits on the rotor part due to poor fuel combustion or increased rotational resistance of the turbocharger due to damaged bearings can also cause a drop in boost pressure.