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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