The Quick Answer above is the generic definition. What follows is the model-specific detail for the Audi models that log P0411.
DTC/P0411·Audi
P0411 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)Audi
P0411 on a Audi means the engine control unit has detected that the secondary air injection system is delivering the wrong amount of airflow into the exhaust. The ECU monitors this via the upstream oxygen sensor and flags the code when the expected lean reading is absent or incorrect during cold start.
Typical repair cost, all makes€45 - €600
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Audi A3
2005-2024The A3 uses the same MQB platform secondary air system as the Golf on 2013+ models. The 2.0 TFSI in earlier 8P models has the pump mounted low in the engine bay where it is exposed to road spray and water. Moisture damage to the pump hose connections is a common cause of flow issues.
What causes P0411 on a Audi?
Beyond the generic causes listed on the main P0411 page, these are the patterns noted for Audi models:
Audi A3Moisture damage to pump connections on 8P 2.0 TFSI
Audi A3Combination valve carbon buildup on MQB platform
How to diagnose P0411 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P0411:
- Start the engine cold and listen for the secondary air pump running (a whirring sound for 30-90 seconds). If you hear it, the pump motor works but airflow may be restricted downstream
- With the pump running, disconnect the air hose at the check valve and feel for airflow. Strong airflow confirms the pump is healthy and the restriction is further downstream
- Inspect the check valve by blowing through it in both directions. Air should pass toward the exhaust side only. If it is stuck shut or leaks in both directions, replace it
- Check all secondary air hoses for cracks, collapsed sections, or disconnections. Even a small leak can reduce flow enough to trigger P0411
- If hoses and valves check out, use a scan tool to monitor the upstream O2 sensor voltage during a cold start. A functioning air injection system should drive the sensor lean (below 0.2V) for the first 30-90 seconds
How much does P0411 cost to fix on a Audi? (EUR)
Estimated repair costs for P0411 in EUR, compiled across makes. Expect Audi parts and labour towards the upper end of each range.
Prices estimated as of March 2026. Costs vary by region, vehicle, and shop.
Codes related to P0411
These codes are often seen alongside P0411 or point to related issues, on any make:
Looking for the full P0411 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0411 guideSkanyx · Audi
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