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DTC/P2279

P2279 : Intake Air System Leak

Quick Answer
Moderee GraviteConduite possible (a court terme)Emissions

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.

Cout de reparation estimeDe 50 € a 750 €+, varie selon le vehicule

Scanne ta voiture en 60 secondes environ : vois si P2279 est vraiment présent, à quel point c'est urgent et ce que la réparation devrait coûter.

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Que signifie P2279 ?

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.

P2279 est un code defaut lie a emissions, classe en gravite moderate. Lorsque le calculateur de ton vehicule detecte cette condition, il enregistre P2279 et allume le voyant moteur.

Quels sont les symptomes de P2279 ?

Si ton vehicule a declenche P2279, tu peux remarquer un ou plusieurs de ces symptomes :

  • Rough or unstable idle, sometimes stalling when coming to a stop
  • Hissing or whistling from the intake area, loudest at idle
  • Long-term fuel trims above +10% at idle, dropping closer to zero at 2500 rpm
  • Fuel economy down 5 to 15% over a tank
  • Hesitation or stumble on light tip-in from a stop
  • Companion lean codes P0171 and/or P0174 stored with P2279

Quelles sont les causes de P2279 ?

Voici les causes les plus courantes de P2279 :

eleveeCracked or split intake boot between MAF and throttle body
eleveeFailed PCV valve, torn PCV diaphragm, or split PCV hose
moyenneLeaking intake manifold gasket, common on aged plastic manifolds
moyenneCracked vacuum line or perished brake booster hose
faibleLeaking throttle body gasket after a cleaning or reinstall
faibleMissing, cross-threaded, or torn-gasket oil filler cap

Peut-on rouler sans risque avec P2279 ?

En general oui, pour des trajets courts. You can drive short distances, but rough idle and lean running can overheat the catalytic converter and trigger misfires. Fix it within a week or two.

Comment diagnostique-t-on P2279 ?

Suis ces etapes pour identifier la cause profonde de P2279 :

  1. Scan for all stored codes. P2279 usually shows up with P0171 and/or P0174, which confirm the lean condition.
  2. 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.
  3. Visually inspect the intake boot, flexing it and checking the underside where cracks often hide, plus the clamps at the MAF and throttle body.
  4. Pull the oil filler cap at idle. If idle changes sharply or the cap sucks down hard, the PCV system needs attention.
  5. Smoke test the intake tract with an EVAP smoke machine at 0.5 psi. Escaping smoke pinpoints the leak in minutes.
  6. With the engine idling, spray carb cleaner or feed propane around suspect joints. An rpm change confirms leak location.
  7. Inspect intake manifold seams, vacuum ports, and the brake booster hose for cracks, especially on plastic manifolds past 150,000 km.
  8. Clear the code, drive a full warm-up cycle, and recheck fuel trims to confirm the repair took.

Combien coute la reparation de P2279 ?

Les couts de reparation de P2279 varient selon la cause profonde et ton vehicule. Voici des estimations courantes :

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace cracked intake boot or hose €25–€90 €30–€80 €55–€170 Facile
Replace PCV valve and associated hoses €15–€120 €40–€150 €55–€270 Facile
Replace intake manifold gasket €40–€150 €250–€600 €290–€750 Professionnel
Replace vacuum lines or brake booster hose €10–€60 €40–€120 €50–€180 Facile
Replace throttle body gasket €15–€50 €80–€180 €95–€230 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

P2279 sur des vehicules specifiques

P2279 se comporte differemment selon ton vehicule. Selectionne ta voiture ci-dessous pour des causes propres au modele, les problemes connus et des estimations de couts ajustees :

Ford

P2279 sur Ford F-150 5.4L Triton 3V

2004-2010

The 5.4L 3V is well documented for split PCV hose elbows and cracked plastic intake manifolds around the coolant crossover. TSB 08-23-4 covers the PCV hose update.

Quelles sont les causes de P2279 sur une Ford F-150 5.4L Triton 3V ?

Ford F-150 5.4L Triton 3VSplit PCV hose elbow at the valve cover (superseded Ford part 3L3Z-6A664-BA)
Ford F-150 5.4L Triton 3VCracked plastic intake manifold at the coolant crossover
Ford F-150 5.4L Triton 3VTorn intake air tube at the throttle body clamp

Cout de reparation de P2279 pour Ford F-150 5.4L Triton 3V

Couts estimes pour les proprietaires de Ford F-150 5.4L Triton 3Vajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a Ford

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace cracked intake boot or hose €28–€99 €33–€88 €61–€187 Facile
Replace PCV valve and associated hoses €17–€132 €44–€165 €61–€297 Facile
Replace intake manifold gasket €44–€165 €275–€660 €319–€825 Professionnel
Replace vacuum lines or brake booster hose €11–€66 €44–€132 €55–€198 Facile
Replace throttle body gasket €17–€55 €88–€198 €105–€253 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

Volkswagen

P2279 sur Volkswagen Golf 2.0 TSI (EA888 Gen 2)

2008-2014

The 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.

Quelles sont les causes de P2279 sur une Volkswagen Golf 2.0 TSI (EA888 Gen 2) ?

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

Cout de reparation de P2279 pour Volkswagen Golf 2.0 TSI (EA888 Gen 2)

Couts estimes pour les proprietaires de Volkswagen Golf 2.0 TSI (EA888 Gen 2)ajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a Volkswagen

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace cracked intake boot or hose €30–€108 €36–€96 €66–€204 Facile
Replace PCV valve and associated hoses €18–€144 €48–€180 €66–€324 Facile
Replace intake manifold gasket €48–€180 €300–€720 €348–€900 Professionnel
Replace vacuum lines or brake booster hose €12–€72 €48–€144 €60–€216 Facile
Replace throttle body gasket €18–€60 €96–€216 €114–€276 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

BMW

P2279 sur BMW 3-Series N54/N55 (E90/E92)

2007-2013

N54 plastic charge pipes crack at the throttle body flange, especially with a tuned car. N55 valve cover CCV/oil separators fail and pull crankcase vacuum into the intake.

Quelles sont les causes de P2279 sur une BMW 3-Series N54/N55 (E90/E92) ?

BMW 3-Series N54/N55 (E90/E92)Cracked OEM plastic charge pipe (N54, part 11617599290)
BMW 3-Series N54/N55 (E90/E92)Failed oil separator in the valve cover (N55)
BMW 3-Series N54/N55 (E90/E92)Perished brake booster vacuum hose at the check valve

Cout de reparation de P2279 pour BMW 3-Series N54/N55 (E90/E92)

Couts estimes pour les proprietaires de BMW 3-Series N54/N55 (E90/E92)ajuste a la hausse par rapport a la moyenne en raison du prix des pieces specifiques a BMW

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace cracked intake boot or hose €33–€117 €39–€104 €72–€221 Facile
Replace PCV valve and associated hoses €20–€156 €52–€195 €72–€351 Facile
Replace intake manifold gasket €52–€195 €325–€780 €377–€975 Professionnel
Replace vacuum lines or brake booster hose €13–€78 €52–€156 €65–€234 Facile
Replace throttle body gasket €20–€65 €104–€234 €124–€299 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

Toyota

P2279 sur Toyota Camry 2.4L 2AZ-FE

2002-2009

The 2AZ-FE is generally leak-tight, but the ribbed intake air connector between MAF and throttle body hardens and splits along the convolutions past 200,000 km.

Quelles sont les causes de P2279 sur une Toyota Camry 2.4L 2AZ-FE ?

Toyota Camry 2.4L 2AZ-FECracked intake air connector (Toyota part 17881-28110)
Toyota Camry 2.4L 2AZ-FEFailed PCV valve at the rear of the valve cover
Toyota Camry 2.4L 2AZ-FELeaking throttle body gasket after a recent cleaning service

Cout de reparation de P2279 pour Toyota Camry 2.4L 2AZ-FE

Couts estimes pour les proprietaires de Toyota Camry 2.4L 2AZ-FEajuste a la baisse par rapport a la moyenne en raison du prix des pieces specifiques a Toyota

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace cracked intake boot or hose €23–€81 €27–€72 €50–€153 Facile
Replace PCV valve and associated hoses €14–€108 €36–€135 €50–€243 Facile
Replace intake manifold gasket €36–€135 €225–€540 €261–€675 Professionnel
Replace vacuum lines or brake booster hose €9–€54 €36–€108 €45–€162 Facile
Replace throttle body gasket €14–€45 €72–€162 €86–€207 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

Honda

P2279 sur Honda Civic 1.8L R18A

2006-2011

R18 owners commonly find the PCV hose to the intake manifold hardens and cracks at the fitting. The IMRC gasket on the lower intake also leaks by 150,000 km.

Quelles sont les causes de P2279 sur une Honda Civic 1.8L R18A ?

Honda Civic 1.8L R18AHardened PCV hose cracking at the manifold barb
Honda Civic 1.8L R18ALeaking IMRC gasket between upper and lower intake
Honda Civic 1.8L R18ASplit intake tube at the accordion section behind the airbox

Cout de reparation de P2279 pour Honda Civic 1.8L R18A

Couts estimes pour les proprietaires de Honda Civic 1.8L R18Aajuste a la baisse par rapport a la moyenne en raison du prix des pieces specifiques a Honda

Reparation Cout des pieces Cout de main-d'oeuvre Estimation totale Difficulte en autonomie
Replace cracked intake boot or hose €21–€77 €26–€68 €47–€145 Facile
Replace PCV valve and associated hoses €13–€102 €34–€128 €47–€230 Facile
Replace intake manifold gasket €34–€128 €213–€510 €247–€638 Professionnel
Replace vacuum lines or brake booster hose €9–€51 €34–€102 €43–€153 Facile
Replace throttle body gasket €13–€43 €68–€153 €81–€196 Moderee

Prix estimes au March 2026. Les couts varient selon la region, le vehicule et le garage.

Ces codes apparaissent souvent avec P2279 ou indiquent des problemes connexes :

Questions frequentes sur P2279

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.

Lis nos guides detailles

Skanyx

Scanne ta voiture avec Skanyx pour diagnostiquer P2279

Ta voiture a enregistré P2279. Skanyx le lit avec n'importe quel adaptateur OBD2 Bluetooth standard, te dit si tu peux continuer à rouler en sécurité et affiche la fourchette de réparation de €50-€750 pour que tu connaisses le montant avant qu'un garage ne te fasse un devis.

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