TEMP--- How many miles on your PT? did you buy it new? Do you usually get in serviced at dealer? Reason Im asking these questions is that my '03 PT with 73k at the time just had both sensors replaced for $100.0( the do recommend doing them in pairs) I dont know why,,,, but Chrysler ate the rest--- ( I think they know there is an issue with them & actually may fall under the federal exhaust system law) contact Chrysler.. good luck,,MJB
** I dont have anything but the standard warranty 7-70K* which was expired)