MajorVery commonEngine

Volkswagen Tiguan: PCV oil separator diaphragm failure (2.0 TSI EA888)

PCV oil separator diaphragm failure (2.0 TSI EA888) is a very common engine fault on the Volkswagen Tiguan on the 2008 onward cars, and we rate it major. Putting it right costs ≈A$320 to ≈A$830 at independent workshop rates, shown as an approximate guide in Australian dollars. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 20 documented faults on the Volkswagen Tiguan.

Vehicle: Volkswagen Tiguan
Engine: 2.0L
Years: 2008 onward
Fuel: petrol
System: Engine

This page covers the Volkswagen Tiguan as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Volkswagen Tiguan faults20 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the PCV / oil separator yet. We would rather show none than show a picture of a different part.

What goes wrong

The positive crankcase ventilation (PCV) valve and oil separator on EA888 2.0TSI engines (all generations, including CAWB, CCZD, CZPA, and DGCA codes) are known to crack, clog, or seize with accumulated soot and congealed oil. When the PCV system fails, crankcase pressure rises abnormally, forcing oil past valve stem seals and the rear main seal, causing external oil leaks and excessive oil consumption into the combustion chamber. A class-action lawsuit in the US documented systemic defective piston rings compounding this failure mode. A high-pitched whistle at idle is the classic symptom of a failed PCV membrane.

What you would notice

High-pitched whistle or hissing from engine at idle
Excessive oil consumption — more than 1L per 5,000 km
Blue-tinged exhaust smoke on acceleration or deceleration
Oil leaks from rear main seal or valve cover gasket

How to check it

Where to look. Valve cover and crankcase ventilation hose, top of engine

With the engine at idle, listen for a vacuum whistle from the top of the engine near the valve cover.
Check the engine oil level and ask how frequently it needs topping up.
Inspect the PCV hose and oil separator housing (typically integrated into or adjacent to the valve cover) for cracks or oil weeping.
Look for blue smoke on a cold restart and during deceleration from highway speed.

Parts involved: PCV / oil separator.

What it costs to put right

≈A$320 to ≈A$830 at independent workshop rates, shown as an approximate guide in Australian dollars. That is for this job on its own, not for the car.

An estimate, converted to Australian dollars, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“How often does the engine need oil topped up between services?”
“Has the PCV valve or oil separator been replaced?”

Now check the Volkswagen Tiguan you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car still has money owing on it, has been written off or reported stolen, what kms it showed in past sale ads, whether it has had accident repair claims and what it is worth today. That comes from the official records for that plate. Enter the plate and its state for the A$17.90 Vehicle Check, or the full history from A$24.99.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Volkswagen Tiguan buyer questions

Is pcv oil separator diaphragm failure (2.0 tsi ea888) serious on a Volkswagen Tiguan?

We rate it major and very common on the Volkswagen Tiguan. The positive crankcase ventilation (PCV) valve and oil separator on EA888 2.0TSI engines (all generations, including CAWB, CCZD, CZPA, and DGCA codes) are known to crack, clog, or seize with accumulated soot and congealed oil. When the PCV system fails, crankcase pressure rises abnormally, forcing oil past valve stem seals and the rear main seal, causing external oil leaks and excessive oil consumption into the combustion chamber. A class-action lawsuit in the US documented systemic defective piston rings compounding this failure mode. A high-pitched whistle at idle is the classic symptom of a failed PCV membrane.

How much does it cost to fix on a Volkswagen Tiguan?

≈A$320 to ≈A$830 at independent workshop rates, shown as an approximate guide in Australian dollars. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Volkswagen Tiguan years are affected?

Our research records this fault on the 2008 onward Volkswagen Tiguan. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.

How do I check for it before I buy?

With the engine at idle, listen for a vacuum whistle from the top of the engine near the valve cover. Check the engine oil level and ask how frequently it needs topping up. Inspect the PCV hose and oil separator housing (typically integrated into or adjacent to the valve cover) for cracks or oil weeping. Look for blue smoke on a cold restart and during deceleration from highway speed. Look here: Valve cover and crankcase ventilation hose, top of engine