The secondary O2 keeps at a static .76 V on idle after warm up while A/F is acting normal, graphing up/down like it should. If you have used Techstream, any idea why the refresh rate of the data sometimes becomes 6000+ms?! I thought this also points to the sensor problem but then this only happens sometimes.
Appreciate the responses, everyone!
P.S. It is not possible to take correct temperature due to the location of the primary CAT by crawling under.