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I have a 2006 Jeep GC 5.7l, I just replaced b2s2 due to LTFT were richer than b1, both bank STFT were tracking about the same. After replacing b2s2 I'm getting ETC P0420, P0430, & P1129.
no codes pending or history before changing the O2 senser, new NGK O2 senser
Attachment 161053
::Edit:: there was B2S2 heater code that's why I replaced it
Looks like there is a leak based on those numbers, but I know Jeep is known for being fussy with the O2 sensors. NTK/NGK should be fine assuming you used the specified part number for that sensor position. Did you use some anti-sieze on the new sensor when installing and torque down to spec? (70-90ft-lbs) A 22mm crowfoot is often needed to get the proper torque on them. If so that 5.7 uses a manifold and precat setup and if one of those bolts came loose you'd see evidence in the O2 sensors though it's typically just below the B2S1 and would affect that sensor as well. The B2S1 numbers looked normal.
Thank you for the input, I'll be pulling the Y-pipe and give it a good look at it. double check the torque and start looking for a leak. the y-pipe is an aftermarket one because when I bought the jeep the person before me cut the cats and welded in BS tubing for straights. What do you think about B1's numbers?
Found the issue.. A hole right at the bung on B1S2, there where no leaks on B2. welded up the hole and tested the y-pipe with my leaf blower and dawn soap. Going reset fuel trim and see what happens.