P2A03 OBD II Trouble Code O2 Sensor Circuit Range/Performance Bank 2 Sensor 1

Symptoms of P2A03 OBD II Trouble Code

  • Diminished fuel efficiency
  • A lack of general engine performance
  • Other related diagnostic trouble codes may also be stored
  • Service engine soon lamp illumination

Common Causes of P2A03 OBD II Trouble Code

  • A failed O2 sensor on bank 2
  • Burnt, broken, or disconnected wiring and/or connectors
  • Engine misfires
  • Vacuum leaks
  • Bad mass air flow or manifold absolute pressure sensor
  • Engine exhaust leaks

Severity of P2A03 OBD II Trouble Code

Since a P2A03 code means that the upstream O2 sensor has failed to input an acceptable signal to the PCM, it should be considered severe.