1998 4.0 5 speedI just replaced my cat and both o2s. Now i have a p172. What do u all think it could be
What brand of sensors did you use? Anything besides NGK/NTK are known to be troublesome.
Bosch O2 sensors have a bad record of causing problems for sure.What brand of sensors did you use? Anything besides NGK/NTK are known to be troublesome.
I personally would look for a leek in the system.
Also might want to check spark plugs.