P0410 on Audi
Secondary Air Injection System Malfunction
P0410 on Audi vehicles indicates secondary air injection system malfunction. Au7o has documented this code across 1 Audi model — most commonly on A8. P0410 indicates the engine computer detected a malfunction in the secondary air injection system, which pumps fresh air into the exhaust during cold starts to help the catalytic converter heat up and burn off pollutants faster. The system uses an air pump, valves, and hoses, and the computer monitors whether the expected airflow and resulting oxygen-sensor response actually occur. When the system doesn't perform as commanded — too little or no airflow detected — it sets this code. It generally points to a failed pump or stuck valve and primarily affects emissions, especially during the first minutes after a cold start. Typical repair costs on Audi range from $80 to $1,400, depending on the specific model and root cause.
Common Causes of P0410
- •Failed secondary air injection pump (seized or worn motor)
- •Stuck or faulty air injection / check valve
- •Vacuum or electrical control problem to the air switching valve
- •Cracked, disconnected, or clogged air injection hoses
- •Moisture or corrosion damage inside the air pump
- •Blown fuse or relay for the air pump
- •Faulty wiring or connector in the air injection circuit
P0410 on Audi by Model
Audi A8(1 issue)
- Secondary Air Injection P0410/P0411 — Cracked Vacuum Lines, Stuck Combi Valves, Carbon-Clogged Head Ports1997-2003
The 4.2 V8 in the D2 A8 (both the early 32-valve ABZ and the later 40-valve AKB/AUX/AYS/BFM) runs a vacuum-operated secondary air injection system with one combi valve per cylinder head, fed by small-diameter hard plastic vacuum lines that become brittle with heat and crack. Both banks have their own combi valve, and it is usually the hard vacuum line that goes to them that breaks and causes a vacuum leak and inoperable SAI. Owners report replacing vacuum hoses and the SAI relay only to have the CEL return, and then having to look at replacing the SAI pump (SAIP), the solenoid on top of the engine, and replacing/cleaning out the combi valves aft of each cylinder head, which involves carbon buildup in the cylinder head ports. Symptom is a check-engine light shortly after a cold start with P0410 (or banked variants P0491/P0492).
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What does P0410 mean on Audi?▼
P0410 stands for "Secondary Air Injection System Malfunction." P0410 indicates the engine computer detected a malfunction in the secondary air injection system, which pumps fresh air into the exhaust during cold starts to help the catalytic converter heat up and burn off pollutants faster. The system uses an air pump, valves, and hoses, and the computer monitors whether the expected airflow and resulting oxygen-sensor response actually occur. When the system doesn't perform as commanded — too little or no airflow detected — it sets this code. It generally points to a failed pump or stuck valve and primarily affects emissions, especially during the first minutes after a cold start. On Audi specifically, this code is documented across 1 model.
What causes P0410 on Audi vehicles?▼
Common causes on Audi: Failed secondary air injection pump (seized or worn motor), Stuck or faulty air injection / check valve, Vacuum or electrical control problem to the air switching valve, Cracked, disconnected, or clogged air injection hoses, Moisture or corrosion damage inside the air pump. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0410 on a Audi?▼
Repair costs on Audi range from $80 to $1,400, depending on the specific model and root cause.
Which Audi models have P0410 documented?▼
Au7o has documented P0410 on 1 Audi model: A8.