Code Definition

P2279 — Intake Air System Leak

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Nissan

About P2279

P2279 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Nissan vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P2279 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The engine control module (ECM) sets this code when it detects unmetered air entering the intake system, causing an imbalance in the air-fuel mixture. This can result in rough idling, hesitation, reduced fuel efficiency, and poor engine performance. The ECM identifies this issue by comparing data from the mass airflow (MAF) sensor, manifold absolute pressure (MAP) sensor, and oxygen (O2) sensors.

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