P2279

Intake Air System Leak

Q: What does fault code P2279 mean?

Intake Air System Leak. Unmetered air is entering the intake system after the MAF sensor (or before the throttle on MAP-based systems).

Q: What are the symptoms of P2279?

Rough idle; Hesitation; CEL; Possible hissing sound at idle

Q: What are the possible causes of P2279?

Cracked intake boot/hose; Loose clamp; Damaged air intake tubing

Severity: Medium Fuel & Air Metering Generic OBD-II Code Est. Repair: $0 - $250 (usually just a hose/clamp)

Schedule diagnosis soon. Continued driving may worsen the issue.

Quick Answer

P2279 means “Intake Air System Leak.” Severity: Medium. Estimated repair cost: $0 - $250 (usually just a hose/clamp). Most common sign: Rough idle.

What Does P2279 Mean?

Unmetered air is entering the intake system after the MAF sensor (or before the throttle on MAP-based systems).

Common Symptoms

Rough idle

Hesitation

CEL

Possible hissing sound at idle

Possible Causes

Cracked intake boot/hose

Loose clamp

Damaged air intake tubing

How to Fix P2279 – Repair Guide

Inspect all intake boots, hoses, and clamps from the air filter box to the throttle body

Repair or replace damaged sections

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Budgeting for This Repair?

A typical P2279 repair runs about $0 - $250 (usually just a hose/clamp). If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

Recommended OBD2 Scanners & Tools

To read and clear this code yourself, you need a reliable OBD2 scanner. Here are top-rated options:

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.