Nissan Titan 2010 5.7 L 150000 miles
Trying to clean the o2 Sensors. They're are 4. This is what I've tried so far: 1) sprayed wd 40, Blast, and melted crayon for the threads. Used an oxygen sensor socket, pipe wrench, even a hose clamp on the o2 Sensor socket. They would not budge. Any suggestion would be greatly appreciated.