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1131 lack of o2 lean bank 1

Discussion in '96-04 - 2V Specific' started by mickey, Sep 6, 2014.

  1. Sep 6, 2014 #1
    mickey

    mickey New Member

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    Now this is a loaded question knowing there are multiple things that can make a car run lean on 1 bank. Was wondering if there is something common to check first? Car is a 98 4.6l auto transmission
     
  2. Sep 8, 2014 #2
    DKblue98GT

    DKblue98GT Well-Known Member

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    How old are your O2 sensors? I recently had the same issue. New upstream O2 sensors fixed mine...
     
  3. Sep 8, 2014 #3
    mickey

    mickey New Member

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    They look original the car has 75,000 miles guess I'll take a closer look at them.
     
  4. Sep 8, 2014 #4
    kvoriley

    kvoriley Member

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    Any exhaust leaks? Passenger side manifold to downpipe gasket if bad could also cause a lean code
     
  5. Sep 8, 2014 #5
    mickey

    mickey New Member

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    No leaks I checked that the other day when I got it