P041F OBD II Trouble Code Secondary Air Injection System Switching Valve A Circuit Low

How to diagnose, repair, and info on symptoms and causes of a P041F DTC code which has to do with a low condition in the switching valve circuit in the secondary air injection system.

Symptoms of P041F OBD II Trouble Code

  • MIL (Low indicator lamp) illumination
  • Increase in tailpipe emissions
  • Engine running rich

Common Causes of P041F OBD II Trouble Code

  • Short to ground on control circuit
  • Short to voltage on control circuit
  • Control circuit open due to damage, etc.
  • Open or short on battery feed circuit to solenoid
  • Open or short on battery feed to relay control circuit