The oxygen sensors are near the catalytic converter underneath the X. I don't know how many but there should be ones before the catalytic converter and after.

EDIT: There are apparently 4 oxygen sensors. 2 before and 2 after the catalytic converters. I would double-check but there may be 2 converters (one for each bank/side). That's why there's 4 total.

I think bank 1 is considered passenger side and bank 2 is driver side.

I assume its a sensor because of these 2 things:
- 02 sensor circuit no activity detected
- Bank 1 sensor 2

Number 4 and Number 5:


BTW.. do you have the actual P-codes? Might want to check the MAF too. Was that a typo on your first post. Did you or did you NOT get any MAF faults?

Some reads for you:

http://www.xoutpost.com/279543-post14.html

http://www.xoutpost.com/454160-post1.html