Fault code problem

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    It shows me a P1656 OCV circuit bank 1 and P0135 Oxygen sensor heater circuit problem when test by N607 Nissan Fault Code Reader.What does this mean and were is the problem ?



    contesy: What year is your Quest?

    The P0135 has to do with a bad Oxygen sensor or connection in bank 1. I can’t find anything on P01656.

    I would have someone take a look at the oxygen sensor and the connection, erase the codes and see if they come back. P0135 & P1656 may be related.

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