Thank you for submitting a question to Manage My Life.
You did not mention whether or not the door will lock. I recommend running the QC test to see if the door will lock. I am including the testing information in the images below. The remaining checks will require the use of an ohm/volt meter and you will have to perform ohm checks and/or live voltage checks. If you have an ohm/volt meter and are confident in your technical abilities, please utilize the checks below.
The sensor you are referring to is the "tachometer" for the rotor/stator (drive motor) assembly.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services
Here is a link that you may use to view the parts list diagram or for parts purchases;
Sears Parts Direct
I hope this is helpful. If I may be of further assistance please reply to this post.