my 2006 Nissan titan 5.6l was showing cat problems,evap problems. I changed 02

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sensors, all 4. then it showed rt side front sensor not responding. had it reset and relearned and drove it over 1000 miles thru tenn mountains. hwy and city,stop and go. there is no check engine light showing and no codes but it shows not ready on evap, sensor, and sensor HTR. lost now. thanks !!