P052E on Porsche: How to Diagnose & Fix
Positive Crankcase Ventilation Regulator Valve Performance
1 Porsche model · 1 documented issue · 1 critical · $500-$8,000 repair
P052E on Porsche by model: symptoms, diagnosis and fix
A number of early 2.0L and 2.5L turbocharged flat-four 718 engines consume oil at a high rate — owners report roughly a quart per 1,000 miles, with the worst cases needing engine replacement under warranty. Some 2019 2.0L cars also suffered oil-separator (PCV) diaphragm failures that let oil be drawn into the cylinders, sometimes appearing right after an oil and filter change.
Common Symptoms
- Frequent low-oil warnings
- Needing to top up oil between services
- Blue smoke from exhaust
- Oil consumption ~1 quart per 1,000 miles
How to Fix
Document consumption with a Porsche oil-consumption test. Replace a failed air-oil separator / PCV diaphragm. Severely affected engines were replaced under warranty by Porsche; otherwise monitor level closely and top up with the correct specification oil between services.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Porsche 0PC115099B complete oil separator
Confirm VIN and order one 9A210747300 seal separately.
- Genuine Porsche 9A210747300 oil-separator seal
2017-2020 718 Cayman 2.0L/2.5L turbo source range; Porsche 9A210747300. This seal alone does not repair consumption.
- Genuine Porsche 9A210790400 AOS diaphragm
2017-2020 Porsche 718 Cayman 2.0L/2.5L source range, part 9A210790400; do not use for housing, port, check-function, turbo or cylinder faults.
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 (2)
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 Porsche?
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 Porsche it is documented across 1 model: Cayman.
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 Porsche?
Published repair estimates on Porsche range from $500 to $8,000 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.
Looking for P052E on a different make?
View P052E across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.