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Audi A3: 1.8T Crankcase Breather / PCV System Failure

1.8T Crankcase Breather / PCV System Failure is a very common engine fault on the Audi A3 on the 1996–2003 cars, and we rate it major. Putting it right costs $120 to $350 at New Zealand independent workshop rates. 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 43 documented faults on the Audi A3.

Vehicle
Audi A3
Engine
1.8L
Years
1996–2003
Fuel
petrol
System
Engine

This page covers the Audi A3 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Audi A3 faults43 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 crankcase ventilation (PCV) system on 1.8T engines uses a plastic valve integrated into the valve cover that separates oil mist from blowby gasses. This plastic valve cracks and degrades with heat cycling, allowing excessive crankcase pressure to build up. The result is oil pushed through the turbocharger seals, burning oil consumption of 1 litre per 1,000 km or more, blue smoke at startup, and fouled spark plugs. A cracked PCV valve also leans the fuel mixture by admitting unmetered air, causing rough running and fault codes.

What you would notice

  • Blue smoke from the exhaust on cold startup or under boost
  • Oil consumption exceeding 0.5 litres per 1,000 km
  • Rough idle and lean fuel trim fault codes stored
  • Oil residue or oily deposits around the intake hoses and air filter box

How to check it

Where to look. Valve cover — crankcase breather valve and associated vacuum hoses

  1. Inspect the PCV hose connected to the valve cover for cracks, oil saturation, or collapse.

  2. Check the intercooler charge pipes for oil pooling.

  3. A VCDS scan for long-term fuel trim values above +10% suggests unmetered air intake.

  4. Remove the oil filler cap while the engine is idling — there should be minimal vacuum but no strong pulsing or blowing.

Parts involved: PCV / oil separator.

What it costs to put right

$120 to $350 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, 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

  • “Has the crankcase breather or PCV valve ever been replaced?”
  • “Does the car consume any oil between services?”
  • “Is there any blue smoke from the exhaust on startup?”

Now check the Audi A3 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 has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

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.

Audi A3 buyer questions

Is 1.8t crankcase breather / pcv system failure serious on a Audi A3?

We rate it major and very common on the Audi A3. The crankcase ventilation (PCV) system on 1.8T engines uses a plastic valve integrated into the valve cover that separates oil mist from blowby gasses. This plastic valve cracks and degrades with heat cycling, allowing excessive crankcase pressure to build up. The result is oil pushed through the turbocharger seals, burning oil consumption of 1 litre per 1,000 km or more, blue smoke at startup, and fouled spark plugs. A cracked PCV valve also leans the fuel mixture by admitting unmetered air, causing rough running and fault codes.

How much does it cost to fix on a Audi A3?

$120 to $350 at New Zealand independent workshop rates. 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 Audi A3 years are affected?

Our research records this fault on the 1996–2003 Audi A3. 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?

Inspect the PCV hose connected to the valve cover for cracks, oil saturation, or collapse. Check the intercooler charge pipes for oil pooling. A VCDS scan for long-term fuel trim values above +10% suggests unmetered air intake. Remove the oil filler cap while the engine is idling — there should be minimal vacuum but no strong pulsing or blowing. Look here: Valve cover — crankcase breather valve and associated vacuum hoses