P2097 Post Catalyst Fuel Trim System Too Rich (Bank 1)

Powertrain Severity: Moderate Generic OBD-II

The downstream oxygen sensor reports rich after the catalytic converter.

Common causes

  • Rich running
  • Faulty downstream O2 sensor
  • Catalyst problem

Symptoms

  • Check engine light
  • Fuel smell

What to check

  1. Check upstream trims
  2. Check downstream sensor
  3. Look for misfires

Manufacturers may add their own detail to generic codes. If your vehicle shows a different description for P2097, follow the service information for that make and model.

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