P0099 OBD II Trouble Code Intake Air Temperature Sensor 2 Circuit Intermittent

Symptoms of P0099 OBD II Trouble Code

  • Slightly diminished fuel efficiency
  • Decreased engine performance (especially upon cold start)
  • Hesitation or surge at idle or upon light acceleration
  • Other drivability codes may be stored

Common Causes of P0099 OBD II Trouble Code

  • Open or shorted #2 IAT sensor wiring and/or connectors
  • Defective #2 IAT sensor
  • Faulty MAF sensor
  • Clogged air filter
  • Broken intake air inlet pipe

Severity of P0099 OBD II Trouble Code

The IAT sensor signal is used by the PCM to calculate fuel delivery strategy, therefore a code P0099 should be treated as severe.