ok guys i need your help, i need to know where the o2 sensors are located on a 97 xj 4.0 automatic 4x4. I am going to take them from a jeep a guys parting, what tools do i need and where are they located how do they look. Also gonna take the pvc valve. where is that located, what does it look like and what tools do i need to remove. i will also be removing the alternator, where should i start on that, what tools should i bring. same for an alternator..

 

Take a complete tool box with you, you never know when you may need that special tool. 7/8 wrench will get the O2 sensors out, they're located on the exhaust before and after the cat convertor.

 

at auto zone they said my xj has 3 o2 sensors


Thanks

 

still need help with location of the pvc
and 3rd o2 sensor

 

Top of the valve cover. The one on the front is the crankcase breather tube and the one on the back is the CCV. You shouldn't have a PVC on your 4.0.

 

i think i do, because everyone i've spoken to until now has said to replace it. i have oil coming into the air filter