Powertrain, generic · Auxiliary emission controls

P0415 AIR System Switching Valve B Circuit

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. P0415 is the general electrical fault in the control circuit of valve B, the second valve on two-valve or two-bank systems such as V engines or Subaru's turbo boxer. It is detected like P0412 for valve A, by comparing the driver's feedback with its commanded state. No manufacturer document available to us describes P0415 specifically; Pierburg's fault table lists it with the same remedies as valve A.

Likely causes

Switching valve B faulty
Wire or connector to valve B faulty
Valve supply or fuse
Engine module

Symptoms

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

Repair estimate

DifficultyEasyDIY possible
Parts and labour€40–350
Time0.3–1.5 h

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

Parts involved

air switching valve bair combination valvevalve wiringengine control module

Related codes

P0416P0417P0412P2442P2443

References: techtips.ie, ms-motorservice.com, law.cornell.edu.