98 GMC Suburban throwing PO174

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by Lttlman, Sep 10, 2012.

  1. Lttlman

    Lttlman New Member

    System to lean (bank 2). Any ideas what maybe causing this?
  2. Pikey

    Pikey Moderator Staff Member 5+ Years ROTM Winner 5000 Posts

    Could be a bad o2 sensor giving poor readings. Does it run smooth? When was the last tune up?

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