P1420moderate severityPowertrain
Secondary Air Injection Module Short to Positive
on 2005 Audi A6 4.2L V8 · AWD
What this code means
The ECU detected a short to positive voltage in the secondary air injection control module circuit. The secondary air system cannot operate correctly for cold-start emission reduction.
Symptoms
- Check Engine Light
- Failed emissions test
- Abnormal engine sound on cold start
Common causes
- Wiring short in secondary air module circuit
- Faulty secondary air injection module
- Damaged connector
- Relay failure
- Corroded wiring
Diagnostic steps
- Test secondary air module circuit for shorts
- Inspect wiring and connector
- Test secondary air pump relay
- Check for voltage at module connector
- Test secondary air pump operation
Repair notes
Repair the wiring short or replace the secondary air injection control module.
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P0010
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P0014
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P0015
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