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Diagnose/P0414
P0414Low SeverityEmissions

Secondary Air Injection Switching Valve A Circuit Shorted

What This Means

The secondary air injection system component signal is cutting in and out unpredictably. 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.