P2279 on Volkswagen
Intake Air System Leak
P2279 on Volkswagen vehicles indicates intake air system leak. Au7o has documented this code across 1 Volkswagen model — most commonly on CC. 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 Volkswagen range from $120 to $400, 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 Volkswagen by Model
Volkswagen CC(1 issue)
- PCV Valve / Oil Separator Diaphragm Failure2009-2017
The EA888's PCV (the integrated crankcase oil separator / pressure-regulating valve) develops a torn rubber diaphragm or stuck check valve. A torn diaphragm passes full intake-manifold vacuum to the crankcase, creating a large vacuum leak. Symptoms include rough/high idle, lean codes, whistling or hissing, oil leaks, and increased oil consumption. Severe cases can pull the rear main crankshaft seal off its mounting plate, turning a cheap part into an expensive repair.
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View P2279 across all makes →Frequently Asked Questions
What does P2279 mean on Volkswagen?▼
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 Volkswagen specifically, this code is documented across 1 model.
What causes P2279 on Volkswagen vehicles?▼
Common causes on Volkswagen: 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 Volkswagen?▼
Repair costs on Volkswagen range from $120 to $400, depending on the specific model and root cause.
Which Volkswagen models have P2279 documented?▼
Au7o has documented P2279 on 1 Volkswagen model: CC.