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p01312 check engine light

  1. Check engine light code P01312, 2001 9-5

    9-5 Workshop
    I own a 2001 9-5. The check engine light sometimes is on, sometimes is off (most of the time is on). According to the mechanic the cause is the oxygen sensor. Checked with a parts dealer and is asking if what I need is the front or the rear or the upstream or downstream sensor...which I haven no...
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