Number and placement of O2 sensors

[4x4Homer]

I can't seem to find the diagram for it. Can someone confirm that there are two upstream and two downstream (for a total of four) O2 sensors on a 2003 SR5 w/ 4L V6?

 

[97hb]

2 02 sensors and 2 AF sensors. AF sensors before the cats on headers, and 02 sensors before the cats on the y pipe.

 

[Blackhawk_194]

They can be a pain to get out, spray them with PB blaster every day leading up to the removal and amazon has good deals on the sensors.. saved 50 bucks over orilleys.

 

[oljedi11950]

Goggle search is better !!!!