was that the only code? first you might want to swap the lower cat monitoring sensors to verify the code .... if when you swap them you get a P0420 then the sensor is bad ... otherwise the pre-cat is shot
options:
1. new precat = $$$
2. headers - $$
3. mil eliminators - $
4. ignor it - not a good idea ...
Thanks for the info. I think you might be right about it being the precats.
How many miles on the engine? If around 80K, precats are usually toast by then. That's when mine went.
Karl