Air leak in intake system between MAF and throttle.
P2279 — also written P2279, P 2279, 2279 — is the OBD-II code for intake air system leak. Same code, same fix: this page covers every spelling of it.
This code means your engine is sucking in (or blowing out) air that hasn't been weighed properly—usually a split hose on a turbo diesel or a cracked manifold on a Vauxhall or VW.
P2279 is a fuel & air fault code, typically costing £40–£350 to put right in a UK garage.
What P2279 actually feels like to drive
- The car 'kangaroos' or jitters when you're cruising at 30mph in 3rd gear.
- A loud 'whooshing' or whistling sound, like a jet engine, when you boot it onto a dual carriageway.
- Car suddenly drops into 'Limp Mode' with 'Service Vehicle Soon' on the dash.
- Black smoke pouring out the back when you're trying to overtake.
- The idle hunts up and down slightly when you're sat at the traffic lights.
What causes P2279?
- Cracked intake hose
- Loose clamps
- Failed gasket
UK vehicles that throw P2279 most often
- Vauxhall Insignia 2.0 CDTi (A20DTH) 2009-2015
- Volkswagen Golf Mk6/Mk7 1.6 & 2.0 TDi 2008-2017
- Ford Focus 1.6 TDCi (DV6) 2011-2015
- Vauxhall Astra J 1.7 CDTi 2010-2014
- BMW 320d (N47) 2007-2013
- Audi A3 2.0 TDi (CR engines) 2009-2016
How P2279 is fixed
- Smoke test
- Hose replacement
The P2279 misdiagnosis that wastes money
I’ve lost count of how many times I’ve seen brand new MAF sensors and EGR valves fitted to cars before they land on my ramp. Blokes see a ‘mixture’ or ‘air flow’ code and immediately bin their old Bosch sensor for a cheap eBay knock-off, which often makes it worse. Nine times out of ten on these modern diesels, the sensor is actually doing its job perfectly—it's just reporting that the air coming in doesn't match what the ECU expects because it’s leaking out of a split hose or a melted plastic manifold.
What a UK garage should charge for P2279
You’re looking at £50 to £80 for a proper diagnostic and smoke test at an indie like mine. If it’s just a split intercooler hose, expect to pay £120 to £180 including the part (Gates or Febi are decent aftermarket brands). However, if the intake manifold itself has cracked or a gasket has gone on a BMW or VW, you can easily top £400 for parts and a good few hours of labour. Main dealers will easily double these prices with their £150+ hourly rates.
P2279 repair cost in the UK
Most P2279 repairs land between £40–£350 including parts and labour. The spread is wide because the cheap fix (a sensor, a hose, a leak) and the expensive fix (a major component) throw the same code — which is why a proper diagnosis before parts are bought saves the most money.
Bob's tip on P2279
Don’t let a garage just 'clear the code' and send you off. Insist on a proper smoke test. I charge 45 quid for a smoke session, and it’s the only way to find those tiny hairline cracks under the intake manifold or a weeping intercooler core that you'll never see with the naked eye. If they don't have a smoke machine, find a garage that does. Also, if you’ve got an Insignia or an Astra, check the big rubber intercooler hose on the left side first—they’re notorious for a 3-inch split that only opens up when the turbo's under load.
Can you drive with P2279?
Drivable.
Urgency: medium.