P0414
Secondary Air Injection System Switching Valve "A" Circuit Shorted
The ECU detected a short circuit in the secondary air injection switching valve A control circuit. With the valve unable to switch correctly, the cold-start emissions strategy fails and the catalyst takes longer to reach light-off.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Switching valve circuit shortedCommon
- Wiring or connector faultPossible
Parts involved
- Secondary Air Valve
- Secondary Air Wiring
P0414 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.