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1997 AUDI A3
1.8L Turbo I4•FWD•AUTOMATIC•gas•turbo
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Repairs0Labor552Torque2383Fluid6DTC638Battery1Maintenance0Recalls0
P1420moderate severityPowertrain

Secondary Air Injection Module Short to Positive

on 1997 Audi A3 1.8L Turbo I4 · FWD

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

  1. Test secondary air module circuit for shorts
  2. Inspect wiring and connector
  3. Test secondary air pump relay
  4. Check for voltage at module connector
  5. Test secondary air pump operation

Repair notes

Repair the wiring short or replace the secondary air injection control module.

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🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years. Spot an error? Use the Help link above — a human reads every report.
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