Diagnose and fix a VW squeaking noise
VW owners may encounter a VW squeaking noise coming from under the hood with the 2.0T engine. The noise sounds almost like a bad belt or idler pulley bearing. In some cases, the noise becomes louder and sounds more like a screech as the engine warms.
It can be related to the transmission. But before you go to the dark side, just pull the oil dipstick. If the noise goes away, the problem is caused by a defective crankcase breather.
When the breather gets clogged, the PCV system still sucks blowby out of the engine. But with a clogged breather, the engine can’t get replacement air, so it sucks it in through the rear main seal. THAT’s what’s causing the noise. Contact a VW dealer to get the right part. There are two different breather valves. See the photo below.
The breather problem can affect VW and Audi 2.0T engines
Posted on by Rick Muscoplat