kevster96k

There is speed sensor at fault code on my car
How can I fix it??

ES300doc

Best to share the symptoms and fault code. Since you have another post advising of a flashing overdrive light. I would assume it's a transmission speed sensor and not an ABS wheel speed sensor. They are pretty easy to change and are external to the transmission. Remove one bolt and slide out, disconnect the wiring harness connector and install the new speed sensor.

Need the fault code so we know if we are talking and input or output speed sensor.
This will likely take care of your flashing overdrive light as well.