P2439 OBD II Trouble Code Secondary Air Injection System Air Flow/Pressure Sensor Circuit Intermittent/Erratic Bank 2

How to quickly diagnose and repair, and causes of a P2439 electrical code which indicates an intermittent or erratic behavior in the secondary air injection system air flow/pressure sensor circuit bank 2.

Symptoms of P2439 OBD II Trouble Code

  • Engine may stall at idle
  • Engine may not start
  • Secondary air injection system making noise
  • Poor engine performance
  • Check engine light illuminated

Common Causes of P2439 OBD II Trouble Code

  • Defective secondary air injection pump
  • Faulty one-way check valve
  • Defective air control solenoid valve
  • Defective air pressure sensor
  • Faulty or damaged wiring
  • Corroded, damaged or loose connector
  • Defective PCM

Severity of P2439 OBD II Trouble Code

The severity of this code can vary tremendously from moderate to severe depending on the specific symptoms of the malfunction. Several symptoms of this trouble code could make driving the vehicle extremely hazardous.