OBD II Fault Code

  • OBD II P2278

OBD-II Code Decreased engine performance is defined as a O2 Sensor Signals Swapped Bank 1 Sensor 3/Bank 2 Sensor 3

The Oxygen Sensors tell the engine control module (PCM) the amount of oxygen left over after the combustion process. each bank (or side) of the motor has its own oxygen sensor. If PCM determines that the wiring harnesses from the sensors have been crossed using a logic based strategy, the PCM will set code P2278.

Decreased engine performance Symptoms

  • Decreased engine performance
  • Increased fuel consumption

Common Problems That Trigger the P2278 Code

  • Oxygen sensor wiring has been misrouted
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