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2005 RAM 3500
5.9L I6 Cummins•4WD•diesel•ISB•turbo
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Repairs0Labor523Torque138Fluid11DTC1684Battery1Maintenance0Recalls0
P0142low severityPowertrain

O2 Sensor Circuit (Bank 1 Sensor 3)

on 2005 Ram 3500 5.9L I6 Cummins · 4WD

What this code means

A general circuit fault was detected on the third oxygen sensor on bank 1. This affects emissions monitoring on that bank.

Symptoms

  • Check engine light on
  • Failed emissions test
  • Slightly reduced fuel economy

Common causes

  • Faulty oxygen sensor
  • Damaged sensor wiring
  • Corroded connector
  • Exhaust leak near sensor

Diagnostic steps

  1. Scan for O2 sensor codes
  2. Inspect sensor wiring and connector
  3. Check for exhaust leaks
  4. Replace oxygen sensor if faulty
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