Hey derb,
....can't say I had that code, but I did change out all four (4) of my O2 sensors after my header installation.
Here's my install and other useful links in the thread that might be helpful:
http://986forum.com/forums/showthre...85052#post85052
I, too, have read from different posts that O2 sensors are "sensitive to vibration", but I haven't found literature to substatiate those claims....
Anyway, hope the folks with more experience can help you out with that code. Also, try asking Loren on renntech??
Cheers!!