What is the actual description of the code. I'm on the wrong computer right now so I don't have a list in front of me.
My first thought would be bad 02 sensor though because I'm pretty sure thats the code the GTP threw when the 02 sensor was bad. Leaded gas and "low lead" gas will cause it to go bad, along with Torco (even though its supposed to be lead free or whatever, the 02 sensors don't like it). If you have run race fuel in the car thats probably why.
Ya that'* what I thought.
I knew it was bad for Cats but since I don't have one.......I forgot to consider the O2.
I ran 5 gallons of it.
Didn't seem to affect my performance or even my mileage.
I have been getting the same mileage as ever.