p0138

  1. D

    P0138 code

    Hi, I am currently receiving a p0138 code. When I view the datastream on my scan tool the o2 sensor starts off at 1.27 volts get stuck there for a min or so, then switches rapidly from 1 volt to 1.27 volts. It however does not follow upstream sensor at all. Faulty o2 or something else. Thanks
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