Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Online purchase of car parts: not a good idea

I purchased these cables for routine maintenance on my Subaru. The car worked prior to putting the cables in... and was bucking and hesitating once the new cables were installed. After a $38.02 diagnostic bill from the mechanic I found out that one cable was bad. Can't say whether the shipping caused damage or the product was defective straight from the manufacturer. Since I wasn't going to wait for my car to sit while a new set came, I got another set from a local auto parts store. I paid more, but it was worth it; if they hadn't worked I could have taken them back immediately for a refund. My car is now purring as it should. I gave it two stars because at least the other three cables worked.I still don't know that Amazon will refund the full amount for the defective product, but I am out the diagnostic fee as well as time and my faith in buying car parts online.