service engine soon

my 97 says service engine soon...i got it on the computer at a valvoline place(just happened to be there) and it said something about (blank) 2 is running rich...i cant remember what it said but i cleared it and now it is showing up....anyone know what could be wrong and how can i fix it?...sorry about asking about a 97...thanksa lot

go to autozone and run codes there. it's free and they will print it out for you, then post again with the code #'s.
joe

thanks...i did...they ran it and got 4 codes...they are all the same...P0175...system running rich....bank 2......i dunno what that means but its apperantly running rich....what do i need to replace...? oh yeah its a 97 4.6L so i dunno if that makes a difference.

i would get some new o2 sensors. that would probably be a good place to start.
joe

How hard is it to change the o2 sensors and how much do they cost?\


Could that also be the reason I hear a fluttering noise when I put the pedal down?