Bob's Mechanical Repairs

Ford P2279

Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].

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Intake air system leak on Ford — perished dump valve diaphragm or split silicone elbow on 1.0/1.5/1.6 EcoBoost.

Ford P2279 — Intake air system leak on Ford — perished dump valve diaphragm or split silicone elbow on 1.0/1.5/1.6 EcoBoost. Typical UK independent garage cost: £35–£280.

What actually causes P2279 on a Ford

P2279 means the ECU sees more air than it should at idle — on EcoBoost it's nearly always a perished dump-valve diaphragm or a split silicone elbow between the turbo and throttle. Smoke test in under 10 minutes.

Ford engines that log P2279

  • 1.0 EcoBoost
  • 1.5 EcoBoost
  • 1.6 EcoBoost (Focus ST/Kuga)

How we diagnose P2279 on a Ford

  1. Smoke-test full intake including dump valve
  2. Inspect dump valve diaphragm — bench-test by mouth suction
  3. Check PCV hose to inlet for splits
  4. Verify oil filler cap seal not blown out

The common misdiagnosis to avoid

Don't replace the throttle body or MAF on P2279 — it's a mechanical leak 95% of the time. Smoke test first, every time.

Ford P2279 repair cost in the UK

Expect £35–£280 including parts and labour at an independent garage. Main-dealer quotes on Ford are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.

Bob's workshop tip

EcoBoost P2279 + sooty residue around dump valve = diaphragm. £45 part, 20 min fit.

Codes usually seen alongside P2279 on Ford

  • P0171
  • P0507
  • P0299

Symptoms drivers report with P2279

  • 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.

Repairs that clear P2279

  • Smoke test
  • Hose replacement

For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P2279 guide.

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