Are these the ones I need and are all 4 the same? Please let me know.

1998 F-150 4.6L 2wd stock cat setup

http://cgi.ebay.com/ebaymotors/ws/eB...RK%3AMEWA%3AIT


Thanks a million in advance. I have over 68k on the truck and I just bought it used this summer, I have read some posts on here that say folks like to replace these every 60k or so. I am not throwing any codes as my Check Engine light is not on. I just thought it might help with gas milage a bit.

Thanks,
Mwkatm

 

Doesn't answer your questions exactly,,
I have a 5.4L and there are two types of O2 sensor.
The pre-cat o2 sensor is different than the post-cat.
Now, the pre-cat for bank 1 is the same as the pre-cat sensor for bank 2 (driver side vs passenger side).

 

Change the two up-stream (front) 02 sensors and leave the back ones (down-stream) alone until they actually fail. The front two up-stream 02 sensors are the ones used for Air/Fuel ratio feedback and from a maintenance standpoint should be replaced every 30K. Use only Bosch brand & Auto Zone sells Bosh 02 sensors