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2007 RAM 3500
5.9L I6 Cummins•4WD•diesel•ISB•turbo
1 active safety recall on this vehicle — view recalls🏆Sponsored by Timmehster
Repairs487Labor523Torque138Fluid11DTC1714Battery1Maintenance0Recalls1
P2196moderate severityPowertrain

O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 1)

on 2007 Ram 3500 5.9L I6 Cummins · 4WD

What this code means

The upstream oxygen sensor on bank 1 is reporting a constant rich signal that the PCM can't correct. This usually means a sensor or fuel mixture problem is skewing the air-fuel readings.

Symptoms

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

Common causes

  • Faulty upstream O2 sensor
  • Fuel injector leaking or stuck open
  • High fuel pressure
  • Contaminated or biased sensor wiring

Diagnostic steps

  1. Scan and record freeze frame data
  2. Check O2 sensor voltage with scan tool
  3. Inspect fuel pressure and injector operation
  4. Test sensor wiring and connectors for shorts
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