P0411Low urgency
Secondary Air Injection System Incorrect Flow
Emission · AIR System
✅ Safe to drive — fix before emissions test.
What this means
The secondary air injection (AIR) pump is not delivering the expected airflow to the exhaust. Failure causes emissions test failures but does not affect driveability.
Likely causes
- Failed secondary air pumpMost common
- Blocked or failed check valveMost common
- Vacuum hose leak in AIR systemCommon
Estimated repair cost
AIR pump replacement$200 – $600
AIR check valve replacement$50 – $200
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Frequently asked questions
What does P0411 mean?
The secondary air injection (AIR) pump is not delivering the expected airflow to the exhaust. Failure causes emissions test failures but does not affect driveability.
Is P0411 serious?
Safe to drive — fix before emissions test.
How much does it cost to fix P0411?
Repair costs for P0411 range from $200 – $600 depending on the root cause and your vehicle.
Can I drive with P0411?
Yes, the vehicle is safe to drive. Schedule a repair at your convenience.