P2279 on BMW: causes, affected engines and fix

Documented faults in BMW engines that can trigger P2279

Grouped by engine or model, from most to least important. These are faults with the turbo, with the EGR valve and with the intake flaps: not all of them will necessarily set the code, and only a diagnosis confirms the cause on your car.

BMW M47

In Serie 1 E87, Serie 3 E46, Serie 3 E90, Serie 5 E60 and X3 E83

- Critical severityFrequency: Very frequentIntakeIntake swirl flap breakage (swirl flaps)Yes: the common rail versions of the M47 (built since 2001) have flaps in the intake manifold that, with diesel soot and heat cycles, can break and be sucked into the cylinder, with a risk of serious damage to the piston, cylinder head and valves.
- High severityFrequency: CommonTurboLoss of power and turbo faultsThe M47's turbo does not usually fail suddenly, but it loses power gradually as carbon builds up in the variable geometry; the 150 hp variant built between September 2001 and November 2003 also accounts for turbo faults documented by specialist workshops.

BMW N47

In Serie 1 E87, Serie 1 F20, Serie 3 E90, Serie 3 F30, Serie 5 E60, Serie 5 F10 and 3 more models

BMW M57

In Serie 3 E46, Serie 3 E90, Serie 5 E39, Serie 5 E60, Serie 7 E65, X3 E83 and 2 more models

- Critical severityFrequency: CommonIntakeBroken intake swirl flapsYes: most automatic M57 and M57TU engines (330d, 530d, 535d, 730d, X3 3.0d and so on) have six metal flaps in the intake manifold that can seize, come loose and wreck a cylinder. The E53 X5 3.0d and the manual gearboxes of the first 330d/530d are free of them, according to a specialist workshop.

BMW N57

In Serie 3 F30, Serie 5 F10, X3 F25, X4 F26, X5 E70, X5 F15 and 2 more models

- High severityFrequency: CommonTurboLoss of thrust on twin-turbo versions due to the vacuum circuit or the actuatorOn the twin-turbo versions (335d, 535d, xDrive35d/40d) it is common to lose thrust at low revs because of a degraded vacuum circuit or dirt in the actuator that synchronises the turbos, not because of a mechanical turbo failure. The variable-geometry turbo is also cited, more generically.

BMW B47

In Serie 1 F20, Serie 1 F40, Serie 2 F22, Serie 2 Active Tourer F45, Serie 2 Active Tourer U06, Serie 3 F30 and 10 more models

- High severityFrequency: OccasionalTurboPremature turbo wear from neglected maintenanceThe B47's turbo does not have a design flaw as well documented as the N47's, but it can wear out early if oil changes are not respected, with repairs that usually run at around €1,000 to €2,000.Repair (garage): €1,000–€2,000

BMW N54/N55

In Serie 1 E87, Serie 3 E90, Serie 3 F30, Serie 5 E60, Serie 5 F10, Serie 7 F01 and 7 more models

- Medium severityFrequency: CommonTurboTurbo wastegate noise and failureOn the N54 the wastegate rods work loose and produce a metallic rattle; over time they reduce boost pressure. On the N55 it is the electric actuator that fails.

BMW N20

In Serie 1 F20, Serie 2 F22, Serie 3 F30, Serie 4 F32, Serie 5 F10, X1 E84 and 2 more models

- Medium severityFrequency: OccasionalTurboWastegate noise and plastic charge pipe breakageThe N20's single TwinScroll turbo is not, in itself, a frequent point of failure, but over the years wastegate noise or rattle and a loss of pressure can appear, and the plastic pipe that carries air from the turbo to the intercooler can crack, especially with poor maintenance or on modified engines.

BMW B57

In Serie 3 G20, Serie 5 G30, Serie 7 G11, X3 G01, X4 G02, X5 G05 and 2 more models

Common causes of P2279 on any make

From most to least likely, according to the sources.

1Vacuum leaks: cracked, split or disconnected hoses, for example those of the brake servo, the vacuum pump or the throttle body.^[2][3][4]
2Crankcase ventilation (PCV): stuck valve, torn oil separator diaphragm or faulty system heater (the N79 on some VAG cars).^[2][3][4]
3Boost air circuit on turbo engines: hoses, connecting pipes or intercooler with micro-cracks that only open under pressure.^[1][4]
4Intake manifold flaps (swirl flaps) with play in the shafts or with the position out of specification.^[3][4]

What to check first

The first diagnostic steps, from the most likely and cheapest to check to the most expensive.

1Read the codes and look at the long-term fuel trims (LTFT) at idle and under load: very high values give away extra air.^[4]
2On Volkswagen 2.5 engines from 2005 to 2013, a manufacturer technical bulletin says to first check the cam timing with the engine idling (the value should be 0 ± 5°) and, if it is correct, continue with the normal diagnosis.^[5]
3Listen for hissing and visually check hoses, clamps, air ducts, manifold gaskets and intercooler pipes.^[2][4]

Full guide to P2279: symptoms, diagnosis and whether you can drive

Frequently asked questions

Which BMW engines have faults that can trigger P2279?

BMW M47 (2 faults), BMW N47 (3 faults), BMW M57 (1 fault), BMW N57 (1 fault), BMW B47 (1 fault) and BMW N54/N55 (1 fault). Each fault has its own page with the affected years and versions, the symptoms and the repair cost.

What does code P2279 mean on a BMW?

Air leak in the intake system. The control unit has detected an air leak in the intake system: more air is entering the engine than the sensors measure (unmetered air or "false air"). The mixture becomes lean and the engine loses the regulation it has calculated. It is a generic OBD-II code: it means the same on a BMW as on any other make.^[1][2][3][4]

Can I keep driving with P2279?

Garage soon. The two sources that assess severity advise against continuing to drive and ask for quick action. Mechanic Base classes it as serious and warns that, with the lean mixture, the engine can suffer permanent damage; a German workshop explains that a lean mixture raises exhaust temperature and, in the long run, damages the exhaust valves, the turbo and the catalytic converter, and can end up generating a P0420.^[2][4]

Sources

Every fact on this page links to its source. If you find an error, let us know.

SureTrack Real Fix: Smoking Out the CracksMitchell 1 · Technical documentation · consulted 2 October 2026
What Does The P2279 Code Mean?Mechanic Base · Technical documentation · consulted 2 October 2026
18711/P2279/008825: Leak in Air Intake SystemRoss-Tech · Technical documentation · consulted 2 October 2026
P2279 Luftleckage Saugrohr: Diagnose & RauchtestKFZ Dietrich · Other source · published 15 May 2026 · consulted 2 October 2026 · in German
TT 24-07-103: 2005-2013 Vehicles with 2.5L Engine - Fault Code P2279 Diagnostic TipVolkswagen Group of America · Manufacturer · published 9 September 2013 · consulted 2 October 2026