P0410 Secondary Air Injection System Malfunction

P0410 indicates a secondary air injection system malfunction. The monitor expected air injection activity and did not see the correct system response.

Code details

Generic OBD-II · P0

System: Emissions
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not replace the pump alone before checking the relay, valves, hoses, and passages; the system fails as a chain, not only as one part.

Symptoms of P0410

Check-engine light, often with no obvious change in how the car drives.
A failed emissions test or incomplete readiness monitors.
Sometimes a faint fuel-vapour smell (on EVAP codes).

Common causes of P0410

A worn catalytic converter or an oxygen/air-fuel sensor reading out of range.
EVAP leaks — a loose or failed gas cap, cracked hose, or purge/vent valve.
Exhaust leaks, fuel-trim problems, or a fault in a related monitor.

Useful checks before replacing parts

Check the air pump, relay, fuse, vacuum or electric switching valves, check valves, hoses, and air passages.
Review oxygen-sensor response during commanded secondary-air operation if the scan tool supports it.
Inspect for water intrusion in the pump and for blocked passages on engines known to accumulate carbon.

Related OBD-II codes

These nearby emissions entries can help compare wording and pin down the fault area.