P0173 – Fuel Trim Malfunction (Bank 2)

Description

Fuel trim on Bank 2 is outside the acceptable range. Learn how to interpret the correction in our Fuel Trims guide.

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Symptoms

  • Rough idle
  • Hesitation
  • Poor fuel economy
  • Check engine light
  • Weak acceleration

Causes

  • Vacuum leak (Bank 2)
  • Faulty MAF sensor
  • Fuel pressure issue
  • Exhaust leak (Bank 2)
  • O2/AFR imbalance

Diagnosis

  • Check fuel trims
  • Inspect Bank 2 vacuum lines
  • Test MAF sensor
  • Measure fuel pressure
  • Check exhaust leaks

Repair

  • Repair vacuum leaks
  • Replace MAF sensor
  • Fix fuel pressure issues
  • Repair exhaust leaks
  • Recalibrate fuel trims

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