Oxygen sensor question

1. clarkeez Newbie Joined: Jul 2012 Posts: 2

   #1 21st December 2013, 21:24

   Hi all,
   
   Is there a difference between the top and bottom oxygen sensors?
   Reason I ask is, I have swapped them around during fitting a new exhaust and cant be bothered to change them back around if there are not different.
   
   ta
2. clarkeez Newbie Joined: Jul 2012 Posts: 2

   #2 21st December 2013, 21:27

   The only reason I ask is because there is a difference in price and wanted to know if its all BS
3. user_64763 Established Member Joined: Jun 2013 York Posts: 2134 Citroen Saxo VTR (2001)

   #3 21st December 2013, 21:36

   The one before the CAT reads the dirty air and the one after the CAT reads the supposedly clean air and the reading off both of these sensors is what adjusts the fuel/air ratio. So I'd say its probably worth swapping them back around!