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Powertrain fault code

P0410: Secondary Air Injection System

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Not urgent for driving, but it affects cold-start emissions.

What P0410 means

The system that pumps air into the exhaust on cold starts is not working as expected.

Common causes

  • Failed air pump
  • Stuck check valve
  • Blown fuse or relay

What to check first

  1. Check the fuse and relay.
  2. Listen for the air pump running for the first minute after a cold start.

Get P0410 explained for your car: $2.99

  • P0410 explained in full for your make and model: meaning, how urgent, likely causes and what to check, in order.
  • A short personal note from us within 24 hours, or your money back.
  • Your own private report page you can save as a PDF or show your mechanic.

Read your car's codes yourself, free

Plug a cheap ELM327 OBD-II adapter into the port under the dashboard and open the scan tool: Chrome or Edge on a computer with a USB adapter, or Chrome on Android with a Bluetooth LE adapter. It reads and clears codes and shows emissions readiness. It does not work on iPhone.

Open the free scan tool

Need help with P0410?

Tell us your car and what it is doing with P0410. We reply by email with what to check first, in plain words. Free.

General guidance only, not a diagnosis. A qualified mechanic should confirm the cause before you replace parts.