987 · Fuel

P2099

Post-Catalyst Fuel Trim System Too Rich (Bank 2)

MED SEVERITY

Same as P2097 for Bank 2 — post-cat fuel trim indicates a persistently rich condition.

SYMPTOMS

  • Check-engine light
  • Possible rough idle

LIKELY CAUSES

  • Failing downstream O2 sensor
  • Fuel delivery issue
  • Leaking injector

DIAGNOSIS STEPS

  • Check downstream O2 data
  • Verify fuel pressure and trims
  • Inspect for injector leakage

RELATED PARTS

  • Rear O2 sensor (Bank 2)
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