Most of the issues with used auto parts can easily be avoided by purchasing new parts if you can afford it. Otherwise, do what you can to have the used parts checked out by your personal mechanic or a reputable auto shop to make sure that they are in good condition and won't harm your vehicle. Try to seek out places that sell second hand parts but still offer warranties and read the guarantees thoroughly to make sure the warranty is of good quality. While buying used can save you money in the short term, it can cost you more in the long term if you don't do your homework before buying used auto body parts.