P1416moderate severityPowertrain
Secondary Air Injection System Bank 2
on 1997 Cadillac DeVille 4.6L V8 Northstar · FWD
What this code means
The PCM detected that the AIR system is not functioning properly on Bank 2. Same operating principle as P1415 but for the opposite bank.
Symptoms
- Check Engine Light
- Failed emissions test
- Cold start rough idle
- Increased cold-start emissions
Common causes
- Faulty AIR check valve Bank 2
- AIR pump failure
- Restricted AIR hose Bank 2
- Relay or fuse issue
- Carbon buildup in passages
Diagnostic steps
- Check AIR pump relay and fuse
- Inspect Bank 2 AIR check valve
- Test AIR pump operation
- Check vacuum lines
- Monitor Bank 2 O2 sensor during AIR test
Repair notes
Inspect Bank 2 check valve for restriction. Replace AIR pump or check valve as needed.
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