1999 Infiniti G20 OBO DIAGNOSTIC CODES

Tiny
LETSMITH
  • MEMBER
  • 1999 INFINITI G20
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 152,670 MILES
CODES PO138, PO139, PO140
FAILED INSPECTION
Friday, November 5th, 2010 AT 10:15 AM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
All those codes refer to issues with the O/2 sensor for bank 1, sensor 2. That would be the downstream sensor. These problems may be the result of another condition in the engine that damaged the sensor but you have to start out by replacing the sensor and then see if any new codes set. I would be surprised if they did.
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Friday, November 5th, 2010 AT 10:33 AM

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