Powertrain, generic · Auxiliary emission controls

P0413 AIR System Switching Valve A Circuit Open

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modeNo

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.

Likely causes

Wire to the valve open or connector loose or corroded
Valve coil burnt out
Fuse of the valve supply blown
Engine module

Symptoms

  • Check engine light on
  • Secondary air inactive
  • Secondary air readiness not set (emission test)
  • Driving normal

Repair estimate

DifficultyEasyDIY possible
Parts and labour€30–300
Time0.3–1.5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

air switching valve aair combination valvevalve wiringengine control module

Related codes

P0412P0414P0416P0411P2441

References: static.nhtsa.gov, techtips.ie, law.cornell.edu.