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Diagnose/P0170
P0170Medium SeverityFuel System

Fuel Trim Malfunction (Bank 1)

What This Means

The fuel trim values on bank 1 are outside the acceptable range. The engine computer cannot adequately adjust fuel delivery to maintain the proper air-fuel ratio.

Common Symptoms

  • Poor fuel economy
  • Rough idle
  • Hesitation
  • Check engine light on

Common Causes

  • Vacuum leak
  • Faulty MAF sensor
  • Fuel pressure issue
  • O2 sensor failure
  • Exhaust leak

Estimated Repair Cost

$100 – $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.