P0418 OBD II Trouble Code Secondary Air Injection System Relay A Circuit Malfunction

Symptoms of P0418 OBD II Trouble Code

  • Frequently, there are no symptoms exhibited with a stored code P0418
  • No SAI pump activation

Common Causes of P0418 OBD II Trouble Code

  • Defective SAI pump relay
  • Shorted wiring, components, and/or connectors in the SAI system
  • Defective SAI pump
  • Blown SAI system fuses

Severity of P0418 OBD II Trouble Code

There is no need to address a stored code P0418 with great urgency. The SAI system is associated only to exhaust emission reduction and is not essential to engine operation.