WF455ARGSWR/A2 washer.
this part is a bit harder to access, but can be easily tested without accessing - if u have a multimeter with piercing probes. for this particular model, i read 1.2volts off each of the two sensors on the above mentioned functioning washer. (machine needs to be plugged in. does not need to be turned on. CN3 on the power control assembly. 1 probe on the orange wire (pin 4), and 1 probe on the red/blue (pins 3&2) wires. turn the drum slowly. watch the meter for maximum voltage.)
don't know where CN3 is? on the back of your washer there probably is a small technical booklet. it will show you where. otherwise, search the interweb!
sears direct has a youtube video on a similar washer that shows you how to access this part on a similar samsung washer, so i won't describe replacing it here.
noteworthy: the metal drum covering the stator has many strong magnets on it -- you'll have some resistance sliding it out!
sears direct had a fair price. good shipping. recommend!