p0500 speed sensor issues

[avensis185]

Hi help needed  I have just purchased a 2001 corolla auto  with a speed sensor issue  quick fix I thought !  Having replaced the said part with toyota genuine part  I am still getting the same error code  the auto box is slow to change from first to second  this is when the eml comes back on after reset  I have checked the wiring as far as the bulk head and it all checks out  . I now at a loss to what else could be wrong  . Any ideas would be helpful thanks in advance