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.
Affected components
- Secondary air pump
- Secondary air valve
- Secondary air hose
Common causes
- High likelihood: Air pump seized (water ingress is a common cause)
- Medium likelihood: Combi valve stuck
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.