Secondary Air Injection System Incorrect Flow Detected
Powertrain Code · Medium
What does P0411 mean?
The secondary air injection system is not flowing the expected amount of air.
System: Emission Controls
P0411 is a powertrain diagnostic trouble code indicating secondary air injection system incorrect flow detected. This code is classified as medium severity, which means: schedule service — affects performance or emissions. We have vehicle-specific diagnostic data for 16 models below. Select your vehicle for tailored causes, symptoms, and repair cost estimates.
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 vehicle.
See causes, symptoms, and repair costs for P0411 on specific vehicles: