Check Engine Light Po430 2002 Es300. Obd Software Screen Shots. Options

[rlx101]

2002 ES300, 154,000 miles (all highway)
I got this CEL - PO430 - Catalyst efficiency below treshhold ( Bank 2 ).
(i've been getting 25-27 mpgs, calculated at the pump, not sure if this is important)

I ordered OBD II --> USB reader off ebay for 25$ shipped and installed this software: OBD 2007
software manual: http://rapidshare.com/files/257591733/OBD_...ogram_Guide.pdf



I am trying to figure out why i Have PO430 and why it randomly appears/disappears. If this was a cat converter wouldnt i have CEL permanently?

I took some screen shots, this is my first time running such extensive OBD diagnostics. Please take a look and comment if you have an idea about what might be going on here or what other tests i should do to troubleshoot this...
(i must say the software is pretty cool and very user friendly, tons of cool features to play with)





610 rpm:



2200rpm:



data snap shot (stored in the ECU) when the PO430 code came up for a first time, i do remember being on the highway and driving at 75mph when this happened:



not sure what this is:



O2 sensors while revving up 600->1400rpm: