P0413 Secondary Air Injection System Switching Valve A Circuit Open

P0413 points to an open circuit in Secondary Air Injection System Switching Valve A. The controller sees the valve A circuit as incomplete or not drawing expected current.

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 overlook a disconnected or corroded valve connector when diagnosing an open secondary air valve A circuit.

Symptoms of P0413

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 P0413

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

Measure valve A supply voltage, control continuity, solenoid resistance, fuse condition, relay output, and connector terminal tension.
Inspect for unplugged connectors, broken wires, corroded terminals, open solenoid windings, damaged vacuum valve assemblies, and harness strain.
Confirm the open condition at the valve and at the controller side before replacing the solenoid or module.

Related OBD-II codes

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