OBD Code P0135

[Kristopher]

I have a 2002 Jeep Liberty Sport with a V-6/3.7L engine 2WD with the trouble code P0135 popping up on the OBD. All four oxygen sensors are new. What could be the problem and how can it be fixed?

Thank you in advance.

 

[1BADKJ]

Swap bank 1 and bank 2 and clear codes. See if problem follows the o2. If it does then the new o2 os bad. If it doesn't follow it then you need a pcm