You might read this thread posted a month or so back.

http://www.contour.org/ubbthreads/showflat.php?Cat=&Board=NW&Number=172188&page=3&view=collapsed&sb=5&o=93&fpart=1

I also think Autozone will read codes for you.

2004 Focus PZEV 2.3L - KW sport suspension, SP camber plates, Eibach front swaybar, FS intake, FS Stealth exhaust, 3.82 Final, Torsen ATB, Prothane MM insert, E1 CSVT wheels 1/4 mile - 15.201@89.4mph