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Diagnose/P0327
P0327Medium SeverityEngine

Knock Sensor 1 Circuit Low Input (Bank 1)

What This Means

The knock sensor 1 on bank 1 is sending a signal below the minimum expected voltage threshold. This typically indicates a sensor failure or wiring issue.

Common Symptoms

  • Check engine light on
  • Reduced performance
  • Timing retarded
  • Possible knock under load

Common Causes

  • Failed knock sensor
  • Open circuit in wiring
  • Loose mounting bolt
  • Corroded connector
  • PCM input failure

Estimated Repair Cost

$150 – $500
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.