What does P2279 mean?
The computer has found an air leak in the intake system based on airflow and fuel trim readings.
Codes are a starting point. They tell you which test failed, not which part to replace. Check for other stored codes and fix those in a sensible order.
Symptoms
- Check engine light
- Rough idle
- Whistle or hiss
Common causes
- Cracked intake boot
- Loose clamp
- Leaking intake manifold gasket
- Cracked PCV hose
How to diagnose P2279
- Smoke-test the intake.
- Inspect all hoses and boots.
How to fix it
- Replace leaking hoses or gaskets
Estimated repair cost
Likely repairs for P2279 run from about $100 to $900, depending on the cause.
| Repair | Typical range (parts + labor) |
|---|---|
| Diagnostic fee (scan + testing) | $100 - $200 |
| Vacuum leak repair (hose/gasket) | $100 - $450 |
| Intake manifold gasket replacement | $300 - $900 |
These are rough US estimates for an independent shop in 2026, based on typical parts prices and standard labor times. Dealers, big trucks, luxury brands and high-cost areas often run higher. They are not quotes. Use the repair cost estimator to adjust for your vehicle.
How serious is P2279?
Moderate severity
Usually drivable.
P2279 FAQ
What does P2279 mean?
P2279 stands for "Intake Air System Leak". The computer has found an air leak in the intake system based on airflow and fuel trim readings.
Can I drive with a P2279 code?
Usually drivable.
How much does it cost to fix P2279?
It depends on the cause. The likely repairs for P2279 range from about $100 to $900 at an independent shop in the US, plus a diagnostic fee of roughly $100-$200. These are rough estimates; dealer prices and some vehicles run higher.
What is the most common cause of P2279?
The most common causes are: cracked intake boot; loose clamp; leaking intake manifold gasket.