P0413AIR System Switching Valve A Circuit Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The switching valve is the electrically driven valve of this path – a solenoid valve, or on Pierburg/VW systems an electric changeover valve that applies vacuum to the pneumatic combination valve; valve A serves the first path or bank 1, valve B the second. P0413 means the control circuit of valve A is open: with the driver switched off the module does not see the expected supply or pull-up level. The check runs continuously. Subaru's two-valve system assigns valve A to bank 1, and its bulletin advises checking the valve of the other bank as well. The valve stays shut and the bank gets no secondary air; flow codes such as P0411 may follow.
- What you may notice
- Check engine light on
- Secondary air inactive
- Secondary air readiness not set (emission test)
- Driving normal
- Likely causes
- LikelyWire to the valve open or connector loose or corroded
- LikelyValve coil burnt out
- PossibleFuse of the valve supply blown
- RareEngine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Easy · Often possible to do yourself.Typical cost: €30 – €300
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.