Diagnostic trouble code P0410 on Audi vehicles — what it means, the common
causes, and how to confirm the real fault before replacing parts.
What does P0410 mean?
P0410 indicates: Secondary Air Injection System.
This relates to the Emissions / auxiliary emission controls system.
Common causes of P0410
Blockage (restricted flow) downstream of secondary air injection sensor G609
Reduced pumping capacity of the secondary air pump
Blockage upstream of secondary air injection sensor G609
Leak in the secondary air system
Faulty pressure sensor (Secondary Air Injection Sensor 1 G609)
Combination valve stuck open or failing to operate correctly
Interchanged connectors or hoses on secondary air injection valves
Oxygen sensor signals not meeting threshold values during diagnostic measurement phase
What to check (live data)
Signal from Secondary Air Injection Sensor 1 G609 (pressure level; compared against ambient pressure sensor and intake manifold pressure sensor signals)
Pressure difference over time during secondary air diagnosis phases (phases 0–7 for 2.0L; phases 0–8 for 3.0L V6)
Oxygen sensor signals compared to threshold values during measurement phase (EU IV/V standard engines)
Secondary air pump running status (should shut off at appropriate phase; fault if pump does not shut off)
Parts often involved in P0410
Secondary Air Injection Sensor 1 G609
Secondary Air Injection Pump Motor V101
Combination valve 1 (vacuum controlled)
Combination valve 2 (vacuum controlled)
Secondary Air Injection Solenoid Valve N112
Secondary Air Injection Solenoid Valve 2 N320
Vacuum pump
Separate air filter for the secondary air system
Resonator
Don't replace parts until the root cause is confirmed — many of these codes are caused by wiring, a connector or an upstream fault, not the part itself.
Get the confirmed root cause for P0410 — on YOUR vehicle
A code is a symptom, not a diagnosis. AutoDX Pro cross-checks several
independent assessments, pinpoints the actual root cause, gives you the
exact tests to confirm it, and shows the parts — only after the cause is
confirmed. Reads your scan-tool photo and decodes your VIN with open
recalls.
P0410 is a diagnostic trouble code: Secondary Air Injection System.
What are the common causes of P0410 on an Audi?
Common causes include: Blockage (restricted flow) downstream of secondary air injection sensor G609, Reduced pumping capacity of the secondary air pump, Blockage upstream of secondary air injection sensor G609, Leak in the secondary air system. The exact cause depends on the vehicle — confirm it before replacing parts.
Can I keep driving an Audi with P0410?
It depends on the fault and your symptoms. Some causes are minor, others can damage components or affect safety. Get the root cause confirmed before deciding.
How do I fix P0410 on an Audi?
Confirm the actual root cause with targeted tests first, then replace only the part that's at fault. AutoDX Pro gives you the root cause, the exact tests, and the parts for P0410 on your specific Audi.