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2002 VOLVO S80
2.9L I6•AWD•AUTOMATIC•gas•B6294S
5 active safety recalls on this vehicle — view recalls
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Repairs0Labor1005Torque6617Fluid14DTC1718Battery2Maintenance0Recalls5
P0411moderate severityPowertrain

Secondary Air Injection System Incorrect Flow Detected

on 2002 Volvo S80 2.9L I6 · AWD

What this code means

The secondary air injection system is not providing the expected airflow.

Symptoms

  • Check Engine Light
  • Failed emissions test

Common causes

  • Blocked AIR passages
  • Stuck check valve
  • Weak AIR pump
  • Exhaust leak allowing backflow

Diagnostic steps

  1. Monitor O2 sensor during AIR pump activation (should go lean)
  2. Check AIR pump output
  3. Inspect check valve
  4. Check for blocked passages

Repair notes

Clear blockage or replace AIR pump/check valve.

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