P2279 means the ECU sees more air in the cylinders than the MAF measured, so unmetered air is entering downstream of the sensor and pushing fuel trims positive.
DTC/P2279·Volkswagen
P2279 on Volkswagen: Causes, Symptoms and Fix Cost
Quick Answer
Moderate SeveritySafe to drive (short-term)Volkswagen
P2279 on a Volkswagen means the ECU sees more air in the cylinders than the MAF measured, so unmetered air is entering downstream of the sensor and pushing fuel trims positive.
Repair cost on Volkswagen€60 - €900
What does P2279 mean on a Volkswagen?
Volkswagen Golf 2.0 TSI (EA888 Gen 2)
2008-2014The EA888 Gen 2 valve cover integrates the PCV diaphragm. When it tears (very common past 100,000 km) you get a huge vacuum leak and instant lean codes. Full valve cover replacement is the fix.
What causes P2279 on a Volkswagen?
Beyond the generic causes listed on the main P2279 page, these are the Volkswagen-specific patterns we see most often:
Volkswagen Golf 2.0 TSI (EA888 Gen 2)Ruptured PCV diaphragm inside the valve cover (part 06H103469T)
Volkswagen Golf 2.0 TSI (EA888 Gen 2)Cracked turbo inlet elbow or MAF-to-turbo hose
Volkswagen Golf 2.0 TSI (EA888 Gen 2)Leaking intake manifold runner (IMRC) flap seals
How to diagnose P2279 on a Volkswagen with OBD2
Follow these steps to pinpoint the root cause of P2279:
- Scan for all stored codes. P2279 usually shows up with P0171 and/or P0174, which confirm the lean condition.
- Read live fuel trims at idle and at 2500 rpm. Strongly positive STFT at idle that normalizes at higher rpm points to a small vacuum leak.
- Visually inspect the intake boot, flexing it and checking the underside where cracks often hide, plus the clamps at the MAF and throttle body.
- Pull the oil filler cap at idle. If idle changes sharply or the cap sucks down hard, the PCV system needs attention.
- Smoke test the intake tract with an EVAP smoke machine at 0.5 psi. Escaping smoke pinpoints the leak in minutes.
- With the engine idling, spray carb cleaner or feed propane around suspect joints. An rpm change confirms leak location.
- Inspect intake manifold seams, vacuum ports, and the brake booster hose for cracks, especially on plastic manifolds past 150,000 km.
- Clear the code, drive a full warm-up cycle, and recheck fuel trims to confirm the repair took.
How much does P2279 cost to fix on a Volkswagen? (EUR)
Estimated repair costs on a Volkswagen (Volkswagen parts and labour typically run 20% above the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P2279 on Volkswagen
These codes commonly cluster with P2279 on Volkswagen vehicles:
FAQ: P2279 on Volkswagen
Can I tape up a cracked intake boot to get home?
Self-fusing silicone tape will hold for a day or two, but the crack keeps propagating with every vacuum pulse. A replacement boot is €25 to €90 and usually a 20 minute job with a screwdriver.
Why does my car idle rough but drive perfectly fine on the motorway?
Manifold vacuum is highest at idle when total airflow is lowest, so a pinhole leak makes up a big percentage of the air the engine sees. At cruise the same leak is a rounding error and closed-loop trims mask it.
Will P2279 damage anything if I keep driving?
The engine won't self-destruct, but sustained lean running raises combustion temps and cooks the catalytic converter over weeks. A new cat is €400 to €1500, so spending €50 on a hose is the smart play.
Can a dirty MAF sensor cause P2279 on its own?
No. P2279 specifically flags air the MAF never saw. A contaminated MAF typically sets P0101 or generic lean codes. Clean it with dedicated MAF spray if it looks oily, but don't stop looking after that.
Does a loose oil cap actually trigger P2279?
On many engines, yes. The oil cap seals the PCV circuit. If it's missing, cross-threaded, or the rubber seal is flat, you pull unmetered air straight into the crankcase and into the intake.
Looking for the full P2279 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P2279 guideSkanyx · Volkswagen
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