P0410
Secondary Air Injection System Malfunction
A general fault in the secondary air injection system. The system pumps fresh air into the exhaust during cold start to accelerate catalyst light-off; common faults are a seized pump, blocked passages or a stuck valve.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Air pump seized (water ingress is a common cause)Common
- Combi valve stuckPossible
Parts involved
- Secondary Air Pump
- Secondary Air Valve
- Secondary Air Hose
P0410 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.