Fiesta flame 2005, no mileage/speedo no work

[Rzrbk]

Hello. 

Can anybody help, 

The speedometer and milage display doesn't wrk on my fiesta, the abs, engine management light is on and the brake system light is on.

The mileage can be read until diving off. 

I have recently had a driver side front wheel bearing changed, and the abs sensor (same side) changed. 

Odb2 code comes up p0500, vehicle speed sensor A. 

Where/what is sensor A? 

Thanks.... 

[iantt]

so as soon as wheel bearing  has been changed the speedo hasnt worked?