P0410 - Secondary Air Injection System Malfunction

Secondary air injection did not operate as expected.

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Code Overview

Secondary air injection did not operate as expected.

Common Causes

• Secondary air pump failure
• Relay or fuse problem in the air-injection circuit
• Stuck check valve or blocked air passage
• Vacuum control fault on vacuum-operated systems

Symptoms

• Check-engine light after cold starts
• Usually little or no drivability complaint once warm
• Failed emissions readiness or inspection

Diagnostic Steps

1. Listen for secondary air pump operation on a cold start
2. Check the related fuse, relay, and power supply to the pump
3. Inspect the air hoses and check valves for blockage or heat damage
4. Look for exhaust backflow or water intrusion that may have damaged the pump

Repair Difficulty

Moderate

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