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2005 RAM 3500
5.9L I6 Cummins•4WD•diesel•ISB•turbo
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Repairs0Labor523Torque138Fluid11DTC1684Battery1Maintenance0Recalls0
P2195moderate severityPowertrain

O2 Sensor Signal Stuck Lean (Bank 1 Sensor 1)

on 2005 Ram 3500 5.9L I6 Cummins · 4WD

What this code means

The upstream oxygen sensor signal is stuck reading lean and not responding normally. This is often caused by a failing sensor or an actual lean condition.

Symptoms

  • Check engine light on
  • Rough idle or hesitation
  • Reduced fuel economy

Common causes

  • Faulty upstream oxygen sensor
  • Exhaust leak near sensor
  • Vacuum or intake air leak
  • Low fuel pressure

Diagnostic steps

  1. Scan and view O2 sensor live data
  2. Check for exhaust and vacuum leaks
  3. Verify fuel pressure and trims
  4. Replace bank 1 sensor 1 if unresponsive
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