I have difficulty of removing the sensor due to narrow spot between the one side of the sensor hex nut and the exhaust manifold body. I have used a lisle 12100 oxygen sensor socket, but it just wont fit due to its thickness. Now I just bought a powerbuilt 648442 from amazon since it has less one hex side due to its bigger hole slot. Hopefully this time it works.

Does anyone tried just using a 7/8 wrench?