One problem related to o2 sensor has been reported for the 2005 Nissan Titan. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Nissan Titan based on all problems reported for the 2005 Titan.
This vehicle has more common failures than any I have seen. Both of the rear leaf spring shackles rotted out. The rear axle seals are now leaking. In 6 months I have replaced 2 oxygen sensors and now for the 2nd time I am replacing the evap canister control valve. Nissan seems to ignore all of these issues and has redesigned many of these problem areas in newer models however does not own up to fixing the issues on vehicles that are on the road.