I would check all the rubber intake tubing connectors carefully for cracks that could cause leaks. And I would also double check in the FSM that you replaced the correct O2 sensor. If bank 0 is the front one, bank 1 might be the rear. I don't remember how they're numbered offhand...


'97 4Runner, '06 F350, '86 4Runner, '05 WR450
http://home.4x4wire.com/erik