The Quick Answer above is the generic definition. What follows is the model-specific detail for the BMW models that log P0411.
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.
Typical repair cost, all makes€45 - €600
Connect any standard Bluetooth OBD2 adapter to your BMW and Skanyx tells you what P0411 means on that engine, whether it is safe to keep driving, and what the fix should cost. Free on iPhone and Android.
Get Skanyx freeWhat 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. Inspect the pump at the same time you replace the check valve, because a pump that has been running against backpressure and exhaust gas may already be damaged.
What causes P0411 on a BMW?
Beyond the generic causes listed on the main P0411 page, these are the patterns noted for BMW models:
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 for P0411 in EUR, compiled across makes. Expect BMW 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 · BMW
Diagnose P0411 on your BMW
Your car logged P0411. Skanyx reads it on any standard Bluetooth OBD2 adapter, tells you whether it is safe to keep driving, and shows the €45-€600 repair range so you know the number before a shop quotes you. Free on iPhone and Android, and you do not need to be a mechanic to read it.
Get Skanyx free