P0410 indicates a general malfunction in the secondary air injection system. This system pumps fresh air into the exhaust during cold starts to help the catalytic converter reach operating temperature faster and reduce cold-start emissions. The code covers pump, valve, and circuit faults.
DTC/P0410·Audi
P0410 on Audi: Causes, Symptoms and Fix Cost
Quick Answer
Low SeveritySafe to drive (short-term)Audi
P0410 on a Audi indicates a general malfunction in the secondary air injection system. This system pumps fresh air into the exhaust during cold starts to help the catalytic converter reach operating temperature faster and reduce cold-start emissions. The code covers pump, valve, and circuit faults.
Repair cost on Audi€33 - €780
What does P0410 mean on a Audi?
Audi A4
2005-2020The 2.0 TFSI in the B7 and B8 A4 shares the VW secondary air system. The combination valve is the most common failure point. Audi recommends replacing the valve and pump together if the pump shows signs of moisture damage.
What causes P0410 on a Audi?
Beyond the generic causes listed on the main P0410 page, these are the Audi-specific patterns we see most often:
Audi A4Combination valve failure on 2.0 TFSI
Audi A4Pump seizure from moisture in cold climates
How to diagnose P0410 on a Audi with OBD2
Follow these steps to pinpoint the root cause of P0410:
- Start the engine from cold and listen for the secondary air pump. It should run for 30-90 seconds. No sound may indicate a dead pump or blown fuse
- Check the secondary air pump fuse and relay. Swap the relay with an identical one from the fuse box to test
- Inspect the air injection hoses for cracks, disconnections, or moisture. Water can enter the pump through the check valve and freeze in winter, destroying the pump
- Remove the secondary air valve and check that it opens freely. Carbon buildup can cause it to stick shut, blocking airflow even if the pump works
- Use a scan tool to command the air pump on and monitor the upstream O2 sensor. A functioning system should show a lean spike on the O2 sensor when the pump activates
How much does P0410 cost to fix on a Audi? (EUR)
Estimated repair costs on a Audi (Audi parts and labour typically run 30% 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 P0410 on Audi
These codes commonly cluster with P0410 on Audi vehicles:
FAQ: P0410 on Audi
What is the secondary air injection system?
It is an emissions system that pumps outside air into the exhaust manifold during cold starts. This extra oxygen helps burn off unburned hydrocarbons and brings the catalytic converter up to operating temperature faster, reducing cold-start pollution.
Can I ignore P0410?
The vehicle will drive normally, but the check engine light will stay on, preventing you from passing an emissions test. In the EU, this will cause a failure at your periodic vehicle inspection. It is best to repair it before your next test.
Why does the secondary air pump fail in winter?
Moisture can enter the air pump through a faulty check valve or through condensation in the hoses. In freezing temperatures, this water turns to ice inside the pump, which can seize and burn out the motor when it tries to run on the next cold start.
Do all cars have a secondary air pump?
No. Many modern engines achieve fast catalytic converter light-off through engine management strategies without a dedicated air pump. The system is more common on European vehicles, particularly VW/Audi, BMW, and Porsche models.
How do I prevent secondary air pump failure?
Ensure the check valve between the pump and exhaust is functioning properly to prevent moisture backflow. Some owners in cold climates install an inline filter or drain. Regular short trips in cold weather are the main cause of moisture buildup.
Looking for the full P0410 reference (all makes, full diagnosis flow, complete repair cost matrix)?
See the main P0410 guideSkanyx · Audi
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