Service engine soon - P1191 too rich

[kevinkay]

First code was valve tank ventilation a month back. Bought a non OEM valve (the one in engine) Code stayed off assumed it was fixed. Went ahead and did 4 new Bosh Oxygen Sensors because I was due for them.
Soon after service light back- code P0444, purge valve again AND Oxygen sensor too rich before cat. bank 2.
I did the test the computer told me to do on the valve - it did not "clock" or click as the test should - no brainer, I screwed up not getting OEM valve. Bought OEM valve. soon after service light again, same codes, purge valve and Oxygen sensor too rich. New valve tests out good with the clocking/clicks. Oxygen sensor tests out OK also.
most recent service light showed only too rich oxygen sensor pre cat.
Is one of my new Bosh Oxygen sensors bad?
HELP - anyone been through this before??
I have reseated all elec connectors at the valve and O2 sensors as well as the valve hose. I do not see any leaks in intake line or vac. lines.