I'm gonna replace my o2 sensor pretty soon. Should I stick with an OEM sensor ($$$), or would it by fine just to get one from NAPA?

 

My stock one's had Ford and Bosch stamped on them, when I went to replace them I headed to Napa and they gave me some Bosch one's. So I don't think there is a difference.

 

I replaced mine with one from advance auto and its been workin fine for about 4 yrs now

 

1996 f150 4x4 ext cab 181000 miles
I replaced the bank 1 (spark plug 1 side) o2 sensor.
I would recommend auto zone.
They will scan the codes at no cost.
They have the o2 sensor for $40.
They will let you use the tools for the night at no cost.
Good luck,
Gene