A Pre-Purchase inspection (PPI) is a detailed assessment by a qualified individual to determine the cosmetic, mechanical, and safety condition of a vehicle before completing the purchase. Most pre-purchase inspections are done by a certified mechanic or automotive technician who is knowledgeable in the make and model of the vehicle being inspected. The intent of the PPI is to uncover existing conditions or to reveal maintenance shortcomings that may become potential safety or financial issues for the buyer in the future. A basic inspection will be mostly visual, which includes putting the car on a hydraulic lift and checking for leaks or broken components. A more involved inspection will include a detailed road test where components such as steering and brakes can be assessed. A thorough inspection will include checking engine compression by performing a Leak-Down test, and computer engine analysis using On-board diagnostic equipment.