4wd service light ---> causes check engine light /O2 sensor code

[99 2 door]

It has happened twice now.

4wd service light - P1875 came on out of the blue. This causes the truck to run horribly. Almost stalls going into 2nd and 3rd gear. I have to put in drive out of OD so it isn't so bad bogging down.

Service Engine light comes on couple of days later - P0161 O2 sensor heater circuit

Goes on for a couple of weeks (not my daily driver) then I hear a light click near the steering column and service 4wd light goes off. It runs like a champ, goes into 4wd with no problems. I wondered what the problem might have been.

5 days ago it pops on again and the entire above happens again and it has been a week.

I was going to start with replacing the 4wd switch, but noticed that there is a 4wd selector switch connector and 4wd actuator connector as well. Should I order all 3 and replace at the same time?

Has anyone else experienced this issue? What I temporarily pull the fuse for 4wd while I try to figure out - any collateral issues?

Thank you for the guidance.

 

[99 2 door]

I pulled the transfer case fuse. It took away these issues, but I still have to figure out the cause.