P2178 OBD II Trouble Code System Too Rich Off Idle Bank 1

Symptoms of P2178 OBD II Trouble Code

  • Malfunction Indicator Lamp (MIL) illuminated
  • Lack of power
  • Occasional misfire
  • Poor fuel economy

Common Causes of P2178 OBD II Trouble Code

  • Faulty air/fuel ratio sensor/oxygen sensor (AFR/O2)
  • Faulty mass airflow sensor (MAF)
  • Rarely - faulty Powertrain Control Module (PCM)