I'm reading the trouble code p0176 in my 2000 Ranger which I understand is a flex fuel sensor. The Haynes manual that I have doesn't address this sensor at all. Where is this sensor? What does it look like?

I did a search and found a post that says the part is quite expensive - ugh! Any help would be appreciated

 

[align=left]Most manuals/sites report that code as assigned to the front O2 sensor, the one before the cat.[/align]