P1416moderate severityPowertrain
Secondary Air System Bank 2
on 1997 BMW 318i 1.8L I4 · RWD
What this code means
The DME detected a malfunction in the secondary air injection system for Bank 2. The system is not delivering sufficient airflow to the exhaust manifold on Bank 2 during cold start conditions.
Symptoms
- Check Engine Light
- Failed emissions test
- Rough cold start idle
- Air pump noise abnormal
Common causes
- Faulty secondary air valve Bank 2
- Carbon blockage in exhaust port Bank 2
- Secondary air pump failing
- Vacuum hose leak to air valve
- Relay or wiring issue
Diagnostic steps
- Test secondary air valve operation Bank 2
- Inspect exhaust ports for carbon buildup
- Test air pump flow output
- Check vacuum supply to air valve
- Inspect relay and wiring
Repair notes
Clean carbon from exhaust ports or replace secondary air valve on Bank 2.
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