P0411 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.
DTC/P0411·BMW
P0411 on BMW: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)BMW
P0411 on a BMW 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.
Repair cost on BMW€61 - €810
What does P0411 mean on a BMW?
BMW 3 Series
2006-2020On the N52 engine, P0411 is frequently caused by a deteriorated check valve that allows exhaust gas to flow back into the pump. The pump may still spin but cannot overcome the backpressure. BMW recommends replacing the check valve and inspecting the pump simultaneously.
What causes P0411 on a BMW?
Beyond the generic causes listed on the main P0411 page, these are the BMW-specific patterns we see most often:
BMW 3 SeriesCheck valve deterioration on N52 engine
BMW 3 SeriesCarbon-blocked air injection ports in cylinder head
How to diagnose P0411 on a BMW 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 BMW? (EUR)
Estimated repair costs on a BMW (BMW parts and labour typically run 35% above the average for this code).
Prices estimated as of May 2026. Costs vary by region, vehicle, and shop.
Related codes that often appear with P0411 on BMW
These codes commonly cluster with P0411 on BMW vehicles:
FAQ: P0411 on BMW
What is the difference between P0410 and P0411?
P0410 is a general secondary air system malfunction code that can indicate electrical, mechanical, or flow issues. P0411 is more specific, meaning the system ran but delivered incorrect airflow. P0411 focuses the diagnosis on flow restrictions rather than electrical faults.
Can blocked air injection ports cause P0411?
Yes. Over time, carbon from exhaust gases can clog the small ports where secondary air enters the exhaust manifold or cylinder head. This blocks airflow even when the pump and valves work perfectly. Cleaning these ports requires removing the air rail.
Will P0411 cause my car to fail its inspection?
Yes. In all EU countries, a stored emissions-related fault code will result in a failed periodic vehicle inspection (TUV, MOT, ITV, APK, etc.). The check engine light must be off and no emissions codes stored to pass.
Is P0411 a common code?
It is common on European vehicles that use secondary air injection, particularly VW, Audi, BMW, and Porsche models. It tends to appear more frequently in cold climates where moisture damages the system components.
Can I pass emissions with P0411?
No. The P0411 code will illuminate the check engine light, which is an automatic failure at any EU roadworthiness test. Additionally, the secondary air system contributes to cold-start emissions reduction, so the actual tailpipe readings may also be elevated.
Looking for the full P0411 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0411 guideSkanyx · BMW
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