Don't know if this news to anyone but wanted to post anyhow. Just remove and cleaned my o2 sensors and turn out my 4.7 has 4 sensors 2 on each side pretty close to each other. Doing some research it seems this a Calafornia emmission package for the 4.7.

 

I could be wrong, but I think that's the norm for the 4.7 engines. I have a 2001 Dakota 4X4 SLT and it also has (4) o2 sensors.

 

You could be right. Just no real reason to have 4 o2 sensors.

 

This is normal... If you have two cats you will have four O2 sensors... two for the upstream side of the cats and two for the down stream side

 

Only 1 cat and all 4 are before.

 

Hmmm... That is strange