P0411 Ford Bronco
Secondary Air Injection System Incorrect Flow Detected · Powertrain Code · Medium · Repair: Moderate
What is P0411?
The secondary air injection system is not flowing the expected amount of air.
When the Ford Bronco triggers code P0411 (secondary air injection system incorrect flow detected), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the Ford Bronco.
This repair is rated moderate, meaning some experience and specialty tools required.
Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Ford Bronco.
Common Causes on Ford Bronco
- Incorrect airflow detected in the secondary air injection system
- Leaking or cracked AIR hoses reducing flow
- Failed AIR pump delivering insufficient flow
- Blocked or rusted check valve in the AIR system
Symptoms
- Check engine light
- No noticeable driveability symptoms
- Failed emissions test
- Slightly elevated cold-start emissions
Notes for Ford Bronco
If both P0410 and P0411 are present, the AIR pump itself is likely the root cause — replace the pump first.