p0411
Moderate
Volkswagen · Sedans
Secondary Air Injection System Incorrect Flow Detected
Quick Answer
Error code P0411 on your Volkswagen Sedans means: Secondary Air Injection System Incorrect Flow Detected. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
Likely Causes
How to Fix It
1
Listen for the secondary air pump running during cold start; if silent, check the pump relay and fuse
2
Inspect the secondary air injection hoses and connections for cracks, disconnections, or blockages
3
Test the combi valve (combination valve) for proper operation using a vacuum pump
4
Remove and inspect the secondary air pump for seized motor or damaged impeller
5
Check cylinder head air injection ports for carbon buildup and clean if necessary
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 (combination valve)
Secondary air hoses
Air pump relay
Related Error Codes