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Diagnose/P0415
P0415Low SeverityEmissions

Secondary Air Injection Switching Valve B Circuit Malfunction

What This Means

The secondary air injection system component circuit has a malfunction preventing normal operation. This system pumps fresh air into the exhaust during cold starts to help the catalytic converter heat up faster and reduce cold-start emissions.

Common Symptoms

  • Check engine light on
  • Failed emissions test
  • No noticeable driveability issues
  • Possible air pump noise

Common Causes

  • Failed air pump
  • Stuck check valve
  • Relay failure
  • Wiring damage
  • Clogged air passages

Estimated Repair Cost

$150 – $700
Parts and labor (varies by vehicle and location)
Difficulty:Moderate

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.