P0411Severity: Low
P0411 – Secondary Air Injection System Incorrect Flow
The system that pumps air into the exhaust on cold start has wrong flow.
What it means
The secondary air injection system pumps air into the exhaust on cold start to cut emissions. If expected flow isn't achieved, this code sets; usually the pump or a valve.
Symptoms
- Check-engine light
- Cold-start idle issues
- Emissions readiness issues
Common causes
- Faulty secondary air pump
- Clogged/faulty diverter valve
- Hose/blockage
- Wiring issue
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Frequently asked questions
What does trouble code P0411 mean?
P0411 – Secondary Air Injection System Incorrect Flow. The secondary air injection system pumps air into the exhaust on cold start to cut emissions. If expected flow isn't achieved, this code sets; usually the pump or a valve.
Can I drive with a P0411 code?
It's usually not urgent, but finding and fixing the cause matters for emissions and fuel economy.