How do you fix the sentence even though car backed in wall it was not damaged into a vague pronoun?

The sentence "Even though the car backed into the wall, it was not damaged" is already grammatically correct and does not contain a vague pronoun.

The pronoun "it" clearly refers to the car, which is the subject of the sentence. There is no ambiguity or confusion about which noun "it" is referring to.

Let me know if you have another sentence you'd like help with!