If you have an abs light on consistently and you check the code and it says rear wheel sensor, it may not be damaged, but just need to be cleaned. So to check if yours in dirty follow this article and it may solve your problem.
Rag or Paper Towels
First start by removing the rear wheel for either passenger or driver side depending on which one you start with. Make sure to support your car on jack stands and not just the jack.
Locate the abs wheel sensor which is directly mounted onto the hub closest to the ground.
Then remove the one 10mm bolt that holds the cover over the abs sensor circled in yellow.
The Opposite Side
What it looks like with the cover off
Next remove the two 10mm bolts from the abs sensor bracket to remove the abs sensor, circled in yellow.
Here's the abs bracket with one bolt removed.
Both bolts removed
Mine were pretty clean, but I cleaned them anyways.
Follow steps 8 - 1 backwards for re-installation.