P2279 on Audi
Intake Air System Leak
P2279 on Audi vehicles indicates intake air system leak. Au7o has documented this code across 2 Audi models — most commonly on S7, S8. 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.
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 Audi by Model
Audi S7(1 issue)
- 4.0 TFSI Crankcase Breather Leak With Warm-Idle Whistle (TSB 2040644/3)2013-2016
Audi TSB 2040644/3 covers 2013-2016 S7 4.0 TFSI vehicles with a warm-idle metallic whistle or grinding sound, an intermittent MIL, and P2279 or P0507 caused by a leaking crankcase-breather pressure-regulating valve.
Audi S8(1 issue)
- 2013-2016 S8 Warm-Idle Whistle from Crankcase Breather Leak - Diagnosis Required2013-2016
Audi TSB 2040644/6 covers a metallic whistling or grinding sound at warm idle, a sporadic MIL and possible P2279 or P0507 on 4.0 TFSI vehicles. A leak in the crankcase breather pressure-regulating module can cause the condition. Audi’s labor table explicitly includes the S8.
Looking for P2279 on a different make?
View P2279 across all makes →Frequently Asked Questions
What does P2279 mean on Audi?▼
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 Audi specifically, this code is documented across 2 models.
What causes P2279 on Audi vehicles?▼
Common causes on Audi: 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 Audi?▼
Repair costs vary widely depending on the root cause and specific Audi model.
Which Audi models have P2279 documented?▼
Au7o has documented P2279 on 2 Audi models: S7, S8.