From: NONONOmisc07@fmguy.com   
      
   In rec.autos.tech, on 27 Mar 2021 19:31:15 -0000, kludge@panix.com   
   (Scott Dorsey) wrote:   
      
   >AK   wrote:   
   >>I had an oxygen sensor replaced.   
   >>   
   >>Prior to that I got 20 mpg in the city for my CX7.   
   >>   
   >>Now I am getting 21.5 mpg.   
   >>   
   >>Could that increase be due to the replacement of the O2 sensor?   
   >   
   >If your O2 sensor was reading low and causing the computer to run the   
   >engine too rich, then yes.   
      
   So if now I get codes P0171 and P0174, which means that both banks are   
   running lean, does that mean replacing the sensors will cause the   
   opposite of what AK had, richer mixturen and decreased mpg?   
      
   This is a serious question, even though I'm sure I'm wrong for some   
   reason.   
      
   2005 Toyota Solara XLE with V6 3.3L engine   
      
   >But it all depends on what kind of engine it is and what kind of   
   >control system came with it and how the sensor failed.   
   >--scott   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)