Does anyone know how many downstream o2 sensors the 2006 nissan quest has and their location.

Thanks

Welcome to NICOclub! I've moved this to the Nissan Quest forum to make sure you get a proper answer to your question.

It looks as if there's only one, but i'm not very familiar with the factory service manuals. Here's a link to the page with the exhaust system, which I found it showing only one in the diagram.

http://www.nicoclub.com/FSM/quest/2006_Quest/ex.pdf

Also, here's a link to all of the Factory Service Manual, if this doesn't have the information you're looking for.

http://www.nicoclub.com/FSM/quest/2006_Quest/

Good luck, i'm sure somebody else will chime in soon that's more familiar with the Quest, but hopefully this is the information you're looking for