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            Faulty O2 sensor? 
             
             
            
            
           
             Hello,
              
              Yesterday on a trip the warning light started flashing 2 long 4 short, meaning a problem with the O2 sensor. 
              
              As far as I know, the bike has no modifications here...I notice the bike is shaking more now, and consuming a lot more fuel...
              
              What should I check first, any ideias? And if I need to replace the o2 sensor, how to do it? I hear it�s quite expensive? :/
              
              Also, I see in ebay some 02 sensor elimination plug, whats that about? I have zero knowledge on FI..... :/
              
              Thanks for your help!! 
             
            
            
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