p0411
Moderate
Audi · SUVs
Secondary Air Injection System Incorrect Flow Detected
Quick Answer
Error code P0411 on your Audi SUVs means: Secondary Air Injection System Incorrect Flow Detected. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Command the secondary air pump on with a scan tool and verify it runs
2
Test the secondary air pump relay and check the associated fuse
3
Inspect the combi valve for carbon buildup preventing it from opening
4
Check secondary air hoses for blockages, cracks, or moisture damage
5
Verify airflow reaches the exhaust manifold ports
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Secondary air injection pump
Combi valve
Secondary air hoses
Secondary air pump relay
Related Error Codes