P2279 — Intake Air System Leak
Category: Powertrain Severity: Medium
Updated:
DTC code P2279 means: Intake Air System Leak. It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include split intake hose after the MAF, damaged intake manifold gasket and broken PCV valve or hoses; it's worth confirming the diagnosis before replacing parts.
Possible causes
- Split intake hose after the MAF
- Damaged intake manifold gasket
- Broken PCV valve or hoses
- Leaking brake booster hose
Symptoms
- Rough or high idle
- Hissing noise
- Check engine light
- Loss of power
How to diagnose it step by step
- Visually inspect hoses and clamps.
- Do a smoke test.
- Check the PCV valve.
- Replace the leaking part.
How to fix it
Smoke-test the intake to locate the leak; it's the fastest and most reliable method. Pay special attention to the boot between the MAF and throttle body.
Estimated repair cost
Hose: $20–120. Intake gasket: $150–500.
Frequently asked questions
What does DTC code P2279 mean?
Intake Air System Leak.
Is code P2279 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P2279?
Yes, short-term driving is fine.
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