P0136
 

I everyone I'm new on this forum hopfully it's as helpful. As my Warrior forum. Anyway I keep throwing a p0136 code, I clear the code and if I just city drive it won't come back but if I get on the highway as well the code is back. I believe it's the rear bank 1 heated 02 sensor, I have cleaned the connection so don't think it's that, what do you all think? Thanks in advance

Year of car and engine type 4 or 6 cylinders?