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Diagnose/P2096
P2096Medium SeverityEmissions

Post Catalyst Fuel Trim System Too Lean (Bank 1)

What This Means

The fuel system downstream of the catalytic converter on bank 1 is reading too lean. The computer is compensating by adding fuel but the downstream O2 sensor still reads lean.

Common Symptoms

  • Check engine light on
  • Reduced fuel economy
  • Possible rough idle
  • Failed emissions test

Common Causes

  • Exhaust leak before or at the catalytic converter
  • Faulty downstream O2 sensor
  • Catalytic converter failing
  • Intake manifold leak
  • Fuel system issue

Estimated Repair Cost

$150 – $800
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.