P2279 on Porsche
Intake Air System Leak
P2279 on Porsche vehicles indicates intake air system leak. Au7o has documented this code across 1 Porsche model — most commonly on 718 Cayman. This code means the engine computer detected an air leak in the intake system downstream of the mass airflow sensor (unmetered air entering the engine). Because this air is not measured, the engine may run lean, idle roughly, or behave inconsistently. The computer flags it when fuel trims or airflow readings indicate more air is reaching the cylinders than the sensor accounts for. It is usually not an immediate safety issue but can cause drivability problems, poor fuel economy, and other related lean codes. Typical repair costs on Porsche range from $400 to $1,200, depending on the specific model and root cause.
Common Causes of P2279
- •Cracked or loose intake hose / air duct after the MAF
- •Vacuum leak (hoses, gaskets, PCV)
- •Loose or damaged intake manifold gasket
- •Faulty or dirty mass airflow sensor
- •Leaking throttle body gasket
- •Unseated or cracked intake boot clamp
- •Failed PCV valve or hose
P2279 on Porsche by Model
Porsche 718 Cayman(1 issue)
- Air-Oil Separator (AOS) Diaphragm Failure2017-2025
The air-oil separator in the crankcase ventilation system can fail, with the internal diaphragm tearing. This lets crankcase vacuum spike and draws engine oil into the intake, producing heavy blue/white exhaust smoke (often worst on cold startup or under load), oil residue in the intake tract, possible whistling/hissing from the engine bay, and lean/rich fuel-trim faults. Failures are documented on 718 flat-four cars, in some cases at very low mileage. Driving with a failed AOS risks oil consumption and, in severe cases, hydrolock/engine damage.
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View P2279 across all makes →Frequently Asked Questions
What does P2279 mean on Porsche?▼
P2279 stands for "Intake Air System Leak." This code means the engine computer detected an air leak in the intake system downstream of the mass airflow sensor (unmetered air entering the engine). Because this air is not measured, the engine may run lean, idle roughly, or behave inconsistently. The computer flags it when fuel trims or airflow readings indicate more air is reaching the cylinders than the sensor accounts for. It is usually not an immediate safety issue but can cause drivability problems, poor fuel economy, and other related lean codes. On Porsche specifically, this code is documented across 1 model.
What causes P2279 on Porsche vehicles?▼
Common causes on Porsche: Cracked or loose intake hose / air duct after the MAF, Vacuum leak (hoses, gaskets, PCV), Loose or damaged intake manifold gasket, Faulty or dirty mass airflow sensor, Leaking throttle body gasket. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P2279 on a Porsche?▼
Repair costs on Porsche range from $400 to $1,200, depending on the specific model and root cause.
Which Porsche models have P2279 documented?▼
Au7o has documented P2279 on 1 Porsche model: 718 Cayman.