P0415AIR System Switching Valve B Circuit
- 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. 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.
- What you may notice
- Check engine light on
- Secondary air inactive on the second bank
- Secondary air readiness not set (emission test)
- Driving normal
- Likely causes
- LikelySwitching valve B faulty
- LikelyWire or connector to valve B faulty
- PossibleValve supply or fuse
- 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: €40 – €350
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.