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I have a 2005 Santa Fe with a 2.7 litre engine.  The check engine light came on a few weeks ago.  I pulled the code with my Actron code reader and it said P0240.  The internet said it could either be one of the 2 oxygen sensors or the converter on bank one.  I took the car to my buddies muffler shop.  He said the converter was ok, had to be one of the two sensors.  He recommended trying the upstream sensor first.  Does anyone have a diy or a link to a website with directions on how to do this.  If he told me right its the one closet to the firewall.  This is my first post so please be kind.