Hi,

I have a 1993 Crown Victoria. I am seeing a few engine codes and want to know where I should start.

I am seeing the following codes:
327 PFE sensor circuit voltage below Self-Test minimum.
326 PFE sensor circuit voltage lower than expected.
176 HEGO sensor circuit indicates lean. (Front Side).
172 HEGO sensor circuit indicates lean. (Rear Side).

The care runs very rough at idle and gets better once it is warmed up. It seems to have lost a lot of power as well. I've done a lot of research and I've read where people have problems with the dpfe sensors. I wanted to make sure that replacing the pfe sensor would be my first step in this case. I don't know if the codes are related and if one going bad would cause something else to read wrong.

Thanks for the help!

Colin