I just posted this morning regarding my 1994 E320, which failed at 8:45 AM.
Initial 8:45 AM numbers were:
Test RPM %CO %O HC CO NO
MEAS MAX AVE MEAS MAX AVE MEAS MAX AVE M

15mph 1359 14.9 0 81 21 56 .47 .06 .11 685 150 590
25mph 1372 14.9 0 47 13 138 .44 .05 .27 696 136 1000

I read these threads regarding turning off the engine during testing and insuring that the car's cat is hot enough pretty extensively and checked that all out with my mechanic over the phone. He agreed with it all and suggested that I drive the car at highway speeds before retesting and trying again. Ran
car for 20 minutes at 65mph with A/C on high and did not shut engine off prior to test.

I just retested and here are the new results and the differences are astounding. Thanks forum dudes! for your help.

VLT Record # 13943: Time 11:13 AM 9/21/07

Test RPM %CO %O HC CO NO
MEAS MAX AVE MEAS MAX AVE MEAS MAX AVE M

15mph 1359 14.9 0 81 21 12 .47 .06 .01 685 150 18
25mph 1372 14.9 0 47 13 5 .44 .05 .01 696 136 18