Causative verbs

[Camilus]

Dear teachers
Which of these two possibilities is more correct?

a)I will get the car [working/worked]
b)I will have the car [working/worked]

Thank you very much in advance.
Best regards

[Rusty]

a)I will get the car [working/worked]
(I will get the car working. = I will make it run properly.
I will get the car worked. Incorrect.
I will get the car worked on. = I will employ somebody to fix the car).
b)I will have the car [working/worked]
(I will have the car working. = I will make/put the car in working order.
I will have the car worked. (Incorrect).
I will have the car worked on. = Same as I will get the car worked on).