Okay! My brother and I found the problem with Titan!
One of the "new" up-stream oxygen sensors "Bosch" was replaced at a different shop and sent back to auto supply store! That one sensor was a no name after market sensor! So always check parts coming in new box from parts supply store! This is my first Nissan Titan, so I'm a rookie on it! But learning it!
By the way I installed the sensors at brothers shop! My fault!
One of the "new" up-stream oxygen sensors "Bosch" was replaced at a different shop and sent back to auto supply store! That one sensor was a no name after market sensor! So always check parts coming in new box from parts supply store! This is my first Nissan Titan, so I'm a rookie on it! But learning it!
By the way I installed the sensors at brothers shop! My fault!