I have some O2 sensor issues. I replaced it, but my engine still gives me a CEL a few times a week (P0172 - too rich), and sometimes P-0136 IIRC (O2 sensor malfunction or something).

Alldata.com says there is a TSB #EG034-07 JUN 07 Engine Controls - Bank 1/Bank 2 O2 Sensor identification

Anyone has a copy of it?

 

the identification TSB just is to tell you what bank is 1 or 2 and what sensor is 1 or 2. Most of the v6's, bank 1 is on the pass side. The tundra v8's is on the drivers side