Symptoms of P2279 OBD II Trouble Code
- Malfunction Indicator Lamp (MIL) illumination with P2279 diagnostic trouble code set
- Stalling at a stop
- Idle "hunts" or surges
- Lack of power
- Dead spots on acceleration
- ECM sets additional codes such as engine miss in number 1 cylinder
- Engine "pings" due to the lean mixture
- Cherry red exhaust manifolds from overly lean mixture
- Hissing sound produced by the air leak
- Increased resistance in the power brakes (harder pedal)
Common Causes of P2279 OBD II Trouble Code
- Leak between engine side of mass airflow sensor and air duct
- Air duct leak engine side
- Leak at intake air temperature sensor
- Leak at throttle body
- Intake manifold crack or leak
- Disconnected or broken vacuum hose
- Bad fuel injector seal at manifold
- Leaky brake booster vacuum hose
- Leak under dash at a vacuum operated device
- Stuck PCV valve
- Stuck crankcase oil filler cap
- Anything and everything connected to the intake manifold could potentially cause this scenario.