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P2196 – O2 Sensor Signal Stuck Rich (Bank 1 Sensor 1)

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Symptoms

  • Rough idle
  • Poor fuel economy
  • Black smoke
  • Hesitation

Causes

  • Faulty O2 sensor
  • Leaking injector
  • Fuel pressure regulator fault
  • ECM fault

Diagnosis

  • Monitor O2 data
  • Check fuel trims
  • Inspect injectors
  • Test fuel pressure

Repair

  • Replace O2 sensor
  • Repair injector
  • Replace regulator
  • Replace ECM
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