MajorCommonEngine

BMW 2 Series: Valve Cover and Gasket Oil Leak with PCV System Failure

Valve Cover and Gasket Oil Leak with PCV System Failure is a common engine fault on the BMW 2 Series on the 2014–2023 cars, and we rate it major. Putting it right costs $900 to $2,200 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 27 documented faults on the BMW 2 Series.

Vehicle: BMW 2 Series
Engine: 1.6L / 2.0L
Years: 2014–2023
Fuel: petrol
System: Engine

This page covers the BMW 2 Series as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All BMW 2 Series faults27 documented faults on this model

What you are looking at

No photograph available

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

What goes wrong

The plastic valve cover on the N20 and B48 engines degrades and warps with sustained heat exposure, causing the integrated PCV (positive crankcase ventilation) membrane to tear or stiffen. A failed PCV creates excessive crankcase pressure that forces oil past the valve cover gasket and other seals. Oil then pools on top of the exhaust manifold shield and can ignite. The valve cover itself cracks around bolt bosses in high-mileage examples. This is a well-documented age/mileage-related fault across the entire 4-cylinder BMW turbo engine range.

What you would notice

Oil burning smell at idle or after parking due to oil dripping onto exhaust heat shields
Oil in spark plug wells causing misfire on one or more cylinders
Blue-tinged smoke from the intake tract or air filter box due to oil-saturated PCV hose
Oil on top of the engine visible after removing the plastic cosmetic cover
Rough idle or misfire codes linked to cylinders with oil-contaminated plugs

How to check it

Where to look. Top of cylinder head, directly under the engine cosmetic cover

Look for oil pooling in the spark plug wells (cylinders 1-4). Check the PCV hose from the valve cover to the intake tract for oil fouling or collapse. With the engine running, feel for excessive crankcase pressure at the oil cap — the cap should not blow off or pulse noticeably. If a workshop inspection is possible: Remove the engine cover and inspect the valve cover perimeter for oil seepage at the gasket line.

Parts involved: Rocker / valve cover, PCV / oil separator.

What it costs to put right

$900 to $2,200 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 valve cover or PCV system been replaced, and was there ever a burning oil smell from the engine bay?”
“Were the spark plugs ever found to have oil contamination during a tune-up?”

Now check the BMW 2 Series 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.

BMW 2 Series buyer questions

Is valve cover and gasket oil leak with pcv system failure serious on a BMW 2 Series?

We rate it major and common on the BMW 2 Series. The plastic valve cover on the N20 and B48 engines degrades and warps with sustained heat exposure, causing the integrated PCV (positive crankcase ventilation) membrane to tear or stiffen. A failed PCV creates excessive crankcase pressure that forces oil past the valve cover gasket and other seals. Oil then pools on top of the exhaust manifold shield and can ignite. The valve cover itself cracks around bolt bosses in high-mileage examples. This is a well-documented age/mileage-related fault across the entire 4-cylinder BMW turbo engine range.

How much does it cost to fix on a BMW 2 Series?

$900 to $2,200 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 BMW 2 Series years are affected?

Our research records this fault on the 2014–2023 BMW 2 Series. 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.