Question about 2001 Nissan Quest

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PO138-PO139 - 2001 Nissan Quest

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P0138- o2 circuit high voltage, bank 1 sensor 2
P0129- 02 circuit slow response Bank 1 sensor 2
rear o2 sensor weak, replace it, will be the one after the caliltice converter.

Posted on Jul 10, 2010

  • elifam Jan 13, 2011

    After replacing the o2 sensor and erasing the trouble code, it 100 miles for the system monitor to complete. After that, the PO139 code reappeared. with the tailpipe emissions well within limits, what do I look for now?. Thanks for any suggestions, Rudy

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There was a factory service bulletin regarding these codes and upgraded replacement parts (oxygen sensors). Since these parts are emissions related they may be required to replace these for free at the dealer. Phone Nissan customer service, corporate and have your VIN number ready. They should be able to tell you if it qualifies. If not, I'd scream and yell, a quick google tells me this is a common problem and they should cover it.

Posted on Jul 10, 2010

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