Secondary Air Injection System Malfunction
Common Symptoms
- Check engine light on
- No drivability symptoms typically
- Failed emissions test
- Possible air pump noise
Most Likely Root Causes
- Failed air injection pump
- Clogged air injection check valves
- Faulty air injection control valve
- Open or short in pump wiring
- Corroded air injection hoses or pipes
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Severity / Derate Risk
Low — emissions failure only.
Component Location
Air injection pump typically in engine bay near firewall or fender. Check valves at exhaust manifold ports.
Manufacturer Notes
Air injection pumps are expensive. Verify pump receives power and ground before condemning. Check valves fail frequently and are inexpensive.
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