It's been a while (2 weeks was an understatement) but upon changing the O2 sensor, (drum roll please), nothing! I just wasted $69. The P0420 problem still exists. I tried the O2 sensor on both sides to make sure I had the right bank but no luck. It's gotta be the pre-cat. Heck, I even changed the Thermostat hoping it was stuck on an open loop with no avail. BTW, I had a heck of a time sealing the thermostat up after changing it, took me about 5 re-installs before I got it right. On another note, someone told me that the catalytic converter is warranted for a total of 100,000 miles by law (for all cars, not just Fords). Anybody know anything about this? The saga continues......
