P0410 Code: Secondary Air Injection System — Causes & Fix
P0410 means a malfunction in the secondary air injection system — the pump that adds air to the exhaust on cold start to cut emissions.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $50 – $800
- Time to fix
- 30 minutes – 2 hours
What it means
Causes include a failed air pump, a stuck switching/check valve, or carbon-blocked passages. P0410 is a generic OBD-II powertrain code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer petrol car or light truck regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine light on
- Usually no drivability effect
- Loud pump noise or failed emissions
How to fix it
- 1
Test the pump and valve
1. Confirm the air pump runs at cold start. 2. Check the switching/check valve.
- 2
Clear blockages
1. Inspect passages for carbon. 2. Repair/replace, then clear the code.
Frequently asked questions
Is P0410 serious?
It rarely affects driving, but it is an emissions fault that fails inspection and can let exhaust into the pump if a check valve sticks.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.