What does code P0411 mean?
Incorrect airflow detected in secondary air injection system
OBD-II Code
P0411 — Secondary Air Injection System Incorrect Flow Detected
Incorrect airflow detected in secondary air injection system
Common symptoms
- Noise during cold start
- high emissions
Possible causes
- Weak pump
- cracked hoses
- faulty check valve
Initial recommendation
Inspect for leaks and verify pump pressure.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0411 with your vehicle's actual symptoms for more complete diagnostic guidance.
Go to the app View more codes