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2005 RAM 3500
5.9L I6 Cummins•4WD•diesel•ISB•turbo
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Repairs0Labor523Torque138Fluid11DTC1684Battery1Maintenance0Recalls0
P0162moderate severityPowertrain

O2 Sensor Circuit Malfunction (Bank 2 Sensor 3)

on 2005 Ram 3500 5.9L I6 Cummins · 4WD

What this code means

The PCM detects a general fault in the oxygen sensor circuit for bank 2, sensor 3. This sensor monitors exhaust downstream of the catalytic converter.

Symptoms

  • Check engine light on
  • Reduced fuel economy
  • Failed emissions test

Common causes

  • Faulty oxygen sensor
  • Damaged wiring or connector
  • Exhaust leak near sensor
  • Faulty PCM

Diagnostic steps

  1. Scan for stored codes and freeze frame
  2. Inspect O2 sensor wiring and connector
  3. Check sensor voltage with scan tool
  4. Replace oxygen sensor if faulty
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