99 Camry 2.2 VSS Acting Up? P0500 Code

My 99 Camry 2.2 (90K orig. miles) has a P0500 code with check engine light. I replaced the VSS with an Intermotor part from Advance. At times the odometer goes out, the speedo needle falls, & the car hesitates. This intermittent issue has continued with the new VSS. Pressing the odometer reset button displays the mileage and the car then drives normally. What’s going on?