Answer :
Answer: Owning a car is not without its risks, repair bills can be quite expensive.
Explanation: The sentence above contains two clauses that are linked incorrectly. A complete clause can be identified if a subject and a predicate exists. The first clause is "owning a car is not without its risks." The second clause is "repair bills can be quite expensive." As both of these can stand alone without further editing, we can confirm that these are both complete clauses. However, because the two clauses were linked with only a comma, the sentence is nongrammatical.
To correctly edit the sentence a conjunction such as "because" should be applied, or a semicolon should be utilized.