P052E on BMW: How to Diagnose & Fix
Positive Crankcase Ventilation Regulator Valve Performance
2 BMW models · 2 documented issues · $400-$1,185 repair
P052E on BMW by model: symptoms, diagnosis and fix
The valve cover gasket can fail, causing oil leaks onto the exhaust manifold which creates a burning oil smell. The PCV valve is integrated into the valve cover, so both are often replaced together.
Common Symptoms
- Burning oil smell
- Visible oil on engine
- Smoke from engine bay
- Oil drips on ground
- Rough idle if PCV failed
How to Fix
Replace valve cover and gasket as an assembly (PCV valve is integrated). Clean oil from exhaust manifold. Monitor for leaks after repair. This is a common maintenance item at higher mileage.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Rein N55 valve-cover kit 11127570292KT4OEM11127570292
Complete valve-cover/PCV replacement kit. Fitment: Verified F30 335i 2012-2015, 335i xDrive 2013-2015, and listed N55 applications; select the exact vehicle/VIN before ordering..
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (1)
All BMW 1 Series E82/E88 models (2008-2013) use plastic valve covers that crack, warp, and deteriorate from engine heat cycling. The valve cover integrates the PCV (Positive Crankcase Ventilation) system, so when the valve cover fails, the PCV also fails - causing oil leaks, vacuum leaks, rough idle, and check engine lights. The plastic valve cover warps from repeated heating/cooling cycles, breaking the seal with the cylinder head. The part number differs by engine (N52, N54 and N55); see the repair section for each. This is a well-documented failure on 1Addicts and Bimmerpost - the plastic valve covers are considered a design flaw that BMW has not corrected. Replace with OEM BMW for best longevity.
Common Symptoms
- Oil leaking from valve cover gasket area
- Rough idle and engine misfires (PCV failure causes vacuum leak)
- Whistling or hissing noise from engine (cracked valve cover)
- Check engine light with lean/misfire codes
- Burning oil smell from oil on exhaust
- Oil accumulation around spark plug wells (fouling plugs)
- Excessive crankcase pressure (oil pushed past seals)
How to Fix
Replace valve cover assembly (includes integrated PCV). N52 (128i): Genuine BMW PN 11127552281 (about $585), labor $200-400. N54 (135i/1M): Genuine BMW PN 11127565284 (about $630) or URO alternative ($180), labor $250-500. N55 (2011-2013 135i): Genuine BMW PN 11127570292 (about $620) or URO alternative, labor $250-500. Total: roughly $430-1,185 depending on parts choice. Replace valve cover bolts simultaneously - they stretch and lose clamping force. Use OEM BMW valve cover for best longevity (URO alternative is cheaper but may not last as long). While valve cover is removed, replace spark plugs and inspect coils to save on future labor.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine BMW N51/N52 cylinder-head cover 11127552281OEM11127552281
Fitment: 2008-2013 E82/E88 128i with N51/N52 only when the cover is warped/cracked or its integrated PCV has failed; confirm VIN..
- Genuine BMW N54 cylinder-head cover 11127565284OEM11127565284
Fitment: 2008-2010 E82/E88 135i and 2011 1 Series M Coupe with N54 only when the cover or integrated PCV has failed; confirm VIN..
- Genuine BMW N55 cylinder-head cover 11127570292OEM11127570292
Fitment: 2011-2013 E82/E88 135i with N55 only when the cover is warped/cracked or its integrated PCV has failed; confirm VIN and production date..
As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.
Sources for this issue (3)
P052E code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P052E mean on a BMW?
P052E stands for "Positive Crankcase Ventilation Regulator Valve Performance." P052E indicates a performance problem with the positive crankcase ventilation (PCV) regulator valve, the valve that meters blow-by gases from the engine crankcase back into the intake to be burned. The computer monitors crankcase pressure or related readings, and when the PCV regulator isn't controlling flow within the expected range, it sets this code. Symptoms can include rough idle, oil leaks from seals due to pressure imbalance, whistling/sucking noises, or increased oil consumption. It points to the PCV valve or ventilation system rather than the fuel or ignition system. On BMW it is documented across 2 models: 3 Series, 1 Series.
What are the most common causes of P052E?
The most common causes of P052E are: Stuck, clogged, or failed PCV regulator valve, Cracked or disconnected PCV hose/line, Vacuum leak in the crankcase ventilation system, Clogged PCV passages from sludge or carbon, Faulty crankcase pressure sensor, Damaged valve cover with integrated PCV (where applicable), Wiring or connector fault on electrically controlled PCV valves. The specific cause varies by vehicle.
How much does it cost to fix P052E on a BMW?
Published repair estimates on BMW range from $400 to $1,185 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.