MasterTuning Fault code dictionary (DTC)

P2279 — Intake air system leak

Severity: Warning Can you drive? With caution: limp mode possible, have it checked soon Make: All makes (OBD-II standard)
MeaningAir is entering without passing the flow sensor. The ECU notices from the gap between measured and expected air, and can no longer meter correctly.
FamilyPowertrain (P)

Typical symptoms

Rough or dropping idle
Hesitation under acceleration
Whistle or hiss in the engine bay
Higher fuel consumption
Reduced power

Common causes

Cracked hose or loose clamp
Hardened manifold gasket
Leaking brake servo or breather pipe
Cracked intercooler
Throttle body not closing properly

What to do

A smoke test finds the leak in minutes and beats any amount of looking. On turbocharged diesels check the intercooler and pressure-side hoses first, where cracks only open under load.

Frequently asked questions

What does code P2279 mean?

Intake air system leak. Air is entering without passing the flow sensor. The ECU notices from the gap between measured and expected air, and can no longer meter correctly.

Can I keep driving with code P2279 active?

With caution: limp mode possible, have it checked soon

Common causes — P2279

Cracked hose or loose clamp Hardened manifold gasket Leaking brake servo or breather pipe Cracked intercooler Throttle body not closing properly

How do you fix code P2279?

A smoke test finds the leak in minutes and beats any amount of looking. On turbocharged diesels check the intercooler and pressure-side hoses first, where cracks only open under load.

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