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Air intakeSeverity Medium: diagnose soon

P2279Intake Air System Leak

What it means

The ECU detects air entering the intake that the MAF didn't measure.

Symptoms

  • Rough idle
  • Hissing noise
  • Lean codes

Common causes

  • Split intake hose or loose clamp
  • Leaking intake gasket
  • PCV hose or valve leak
  • Brake booster hose leak

What to check first

  1. Smoke-test the intake
  2. Compare fuel trims at idle and 2,500 rpm
  3. Check the PCV system
Can I drive with P2279? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P2279: questions and answers

What does P2279 mean?

P2279: Intake Air System Leak. The ECU detects air entering the intake that the MAF didn't measure.

What are the symptoms of P2279?

Rough idle. Hissing noise. Lean codes.

What causes P2279?

Split intake hose or loose clamp. Leaking intake gasket. PCV hose or valve leak. Brake booster hose leak.

How do you diagnose P2279?

1. Smoke-test the intake 2. Compare fuel trims at idle and 2,500 rpm 3. Check the PCV system

Can I drive with P2279?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.