P2279 — Intake Air System Leak
The ECU has detected a discrepancy between commanded throttle/intake conditions and the resulting MAP/MAF that points to unmetered air entering after the throttle body. On turbocharged engines this often means a cracked or disconnected boost pipe between turbo and intake; on naturally aspirated engines, a hole in the intake manifold or hose.
General code reference. Confirm the definition and diagnostic procedure for your vehicle's year, model and engine. A stored code alone does not identify a failed part.
Affected components
- Intake manifold
- Intercooler pipe
- Throttle body
Possible causes to check
These are possible checks, not a ranked diagnosis. Follow the vehicle manufacturer's test procedure before replacing parts.
- Boost pipe disconnected or cracked
- Intake hose split
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Check each reference's vehicle and model-year scope. General background links do not establish which fault is most likely on your vehicle.
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.