Symptoms of P0479 OBD II Trouble Code
- Malfunction Indicator Lamp (MIL) illuminated
- Lack of power
- Lack of engine braking
- Longer than normal cold engine warmup time
Common Causes of P0479 OBD II Trouble Code
- Blockage in the tube from the exhaust manifold to the pressure sensor
- Exhaust system / Air Inlet / Charge Air leaks
- Intermittent open in the ground circuit to the exhaust pressure sensor
- Intermittent open in the signal circuit between the exhaust pressure sensor and the PCM (powertrain control module)
- Intermittent short to voltage in the signal circuit to the exhaust pressure sensor
- Exhaust Gas Pressure Sensor
- Possibly turbocharger overboost
- Possibly the PCM has failed (highly unlikely)