* Faulty Air Injection Pump: The pump itself might be malfunctioning, not pumping enough air, or not pumping at all.
* Clogged Air Injection System Lines or Pipes: The tubes and pipes that carry air can become restricted by rust, debris, or damage.
* Faulty Air Injection Pump Relay or Fuse: The electrical components controlling the pump could have failed.
* Vacuum Leaks: Leaks in the vacuum lines that control the system can prevent proper operation.
* Problems with the Air Injection Solenoid Valve: This valve controls the flow of air and can malfunction.
* Blocked Air Injection Diverter Valve: If this valve is stuck closed it will prevent air from entering the exhaust system.
To diagnose the problem accurately, a mechanic will need to use a scan tool to check for more details and visually inspect the system for leaks, blockages, or damaged components. Simply clearing the code without addressing the root cause will likely result in it returning.
