subject: Purchasing A Used Car in Illinois [print this page] Before making any payment on a used car, ensure that is checked and certified by an independent and honest mechanic. A faulty car at the point of purchase could prove costly when it comes to repairs afterwards. Although all resale vehicles in Illinois undergo a safety inspection, most dealerships don't carry out a mechanic inspection. Those who do, usually withhold the information from the buyer. An honest mechanic can save you money by noticing weak spots that may result to problems in future.