Fault codeP0410

MODERATE

Secondary Air Injection System Malfunction

What this code means

Secondary Air Injection System Malfunction.

P0410 is a generic code: it means the same thing on every make. P0410 belongs to family P04xx — Emission controls. Its page explains how to read a code and groups all its codes by part.

Secondary air injection

On some petrol engines, an electric pump blows fresh air into the exhaust for the first minute after a cold start. The extra oxygen helps the catalytic converter reach its working temperature faster. A valve opens the air path and prevents exhaust gas from flowing back.

What you notice

Usually nothing in driving; sometimes a pump noise that stays or is missing at cold start, and a failed emissions test.

How to check it

The pump and the check valve often suffer from moisture: condensation corrodes the pump, and a leaking valve lets exhaust into the system. Check the relay, the fuse, the hoses and the pump's operation at cold start: it should be heard running for about a minute.

Watch it live in Klaro

With an OBD2 adapter plugged in, these live readings show the part at work, when your car reports them:

Short term fuel trim bank 1
Long term fuel trim bank 1

What to do

Have it checked this week. The car remains usable, but the fault will not clear itself and will fail the roadworthiness test.

Clearing a code switches the light off but repairs nothing: if the fault remains, the code comes back. Clearing a fault code yourself →

How to read this code

PPowertrain
0standardised code
4Emission controls
10P0410