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OBD Code P2279

Intake Air System Leak

CodeP2279
DescriptionIntake Air System Leak
Possible CausesCracked intake boot; Loose clamp; Torn vacuum hose
SymptomsRough idle; Lean codes; Whistling noise
SystemAir Metering

What Does P2279 Mean?

Intake Air System Leak. This diagnostic trouble code (DTC) is stored when the vehicle's onboard computer detects an issue with the air metering.

Code Breakdown

P = Powertrain code

2 = Manufacturer-specific

How to Fix P2279

Follow these diagnostic steps to identify and resolve the issue. Always start with the simplest checks before moving to more involved repairs.

  1. Inspect the air filter and replace if dirty or clogged.
  2. Check the air intake duct and hoses for cracks, holes, or disconnections.
  3. Inspect the MAF sensor for contamination — clean with MAF-specific spray.
  4. Check the intake air temperature (IAT) sensor for proper readings.
  5. Look for any aftermarket intake modifications that may cause issues.
  6. Clear codes and verify MAF and IAT readings are within normal range.

Note: These are general diagnostic guidelines. Some vehicles may have model-specific procedures. Always consult your vehicle's service manual for exact specifications and torque values. If you are not comfortable performing these steps, visit a qualified mechanic.

Frequently Asked Questions

Is P2279 serious?

The severity depends on the underlying cause. Some triggers for P2279 are minor (like a loose gas cap), while others may indicate a more significant problem. We recommend having the code diagnosed with a proper scan tool to determine the exact cause before deciding on urgency.

Can I clear P2279 myself?

You can clear any OBD-II code with a code scanner or by disconnecting the battery for 15-30 minutes. However, clearing the code without fixing the underlying problem will cause it to return — usually within one or two drive cycles. If the code triggered the check engine light, the light will come back on. Fix the root cause first, then clear the code.

How much does it cost to fix P2279?

Repair costs vary widely depending on the root cause. Some fixes are free (like tightening a gas cap) while others can cost several hundred dollars (like replacing a catalytic converter or oxygen sensor). A proper diagnosis with a professional scan tool — not just reading the code — is the first step to getting an accurate repair estimate. Many auto parts stores offer free code reading, but a thorough diagnosis usually requires a mechanic.

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