As Datatek says, the EAS is fussy, it will know that the reading from the sensor is incorrect before doing anything, as the reading may be currently out of the prescribed limits, so even without doing anything, it knows there is a fault.
Disconnect the sensor, clean the contacts using a contact/electrical cleaner (not WD40) and see what happens... If you have the same fault, check the wiring is sound and if that checks out, it may be time for a replacement.....and yes you will have to recal after fitment!