2015 rancher

I bought a new angle shift sensor and it works fine for 5 or 10 minutes then does what it wants.Keeps giving a 22 code.buy another sensor ,same thing.Good for awhile and does what it wants.I did this with six oem sensors and my shift motor is fine with a new battery.Iv'e checked all my connections and put grease on them.It's a fa5 dtc rancher and well taken care of.Has 3600 miles and never had a problem till i left it in storage for a year but drove it atleast every month.mechanics in my area don't even want to mess with es models.I don't have a check engine light and wondering would it be worth buying a diagnostic tester?I hear of alot of people buying ecu units and didn't solve the problem.I also checked for mice damage.If anyone has any idea i sure would appreciate it because i can't even get a shop to look at it.

I'm sure the sensor went in right since it was shifting fine for awhile then started getting dash marks instead of gear showing.

I replaced it with white lithium grease and cleaned all my connecters with electrical spray and electrical goop.Seems like everytime i take it apart it will work for a few minutess then it has a mind of it's own.I hate computers,wish i bought a foot shift.

I just completetly cleaned all the gears behind the shifter motor on my 420 rancher and it was good for maybe 5 minutes.I cleaned out the motor itself and it looked clean and alot of life left on the brushes.I replaced the shift angle sensor and still acting up.Now if i press the down button i can see it moving the tool three or four times.If i have a bad part shouldn't it throw a code?I can't keep buying parts and hope this time will work.I can't afford a mechanic and always worked on my own bikes but i'm not to computer smart.Do they make a bypass for the 420?I see them for the 350s

i don't know about transmission

battery is new but it is a ebay part.I just put it in reverse and that's all i had.Even with the tool there isn't any numbers showing just a dash.

I know this subject has gone on for years but it finally happened to my 2015 rancherI it was shifting fine then i had to use the tool for the first time because it stopped shifting.I found a code 23 in the gear shift section of display which is shift angle sensor.Replaced it and it was fine for five minutes and now it won't shift again.Seems like it screwes up when it gets hot.I also cleaned out the grease.It sat in storage unit for three years also.I can't afford to have someone fix this so all the hel would be deeply appreciated.It's showing a dash mark instead of gear numbers but if i shut it down it might show up.It's never the same on what it does.