find the mistakes : I went to the garage to repair my car ( the final secondary stage exam)

I went to the garage to have my car repaired.

What's the answer and Why?
I see the sentence is correct

I went to the garage to have my car repaired
that means : the mechanic repaired it for me.

it must be put in a causative form
I went to the garage to have my car repaired

I went to the garage to have my car repaired
if you can repair it yourself why did you go to the garage

I went to the garage to have my car repaired....This is called "causative" in English grammar meaning that someone else does the action for me.Likewise , we can say :I went to the barber to have my hair cut.....

to have my car repaired

I went to the garage to have my car repaired

to have my car repaired