O2 sensor question

[Barchulo]

Are both the upstream and downstream o2 sensors wideband? Or is it just the upstream (primary)?

[whatsvtec]

This isn't meant to be rude or insulting. Try posting in the thread linked below.

Simple Q's & A's (http://www.ephatch.com/forum/showthread.php?62000-Small-Quick-Common-Dumb-Question-Thread-(use-this-instead-of-making-new-threads))

I linked that since I'll probably be using it a lot once I dig in to the work my car needs.

[TheKone]

Are both the upstream and downstream o2 sensors wideband? Or is it just the upstream (primary)?

Neither are wideband. Both are narrow band. AFIK no factory ECU's can read wideband signals, therefore all factory o2 sensors are narrow band. I'm not completely sure but I am pretty sure.