Sales and awareness of certified pre-owned vehicles continue to increase, despite competition from aggressive new-vehicle incentives, according to the JD Power and Associates 2003 used vehicle sales and certification study. The study, which measures the satisfaction and experiences of owners of late-model used vehicles that have undergone a dealership certification process, finds that sales of certified pre-owned (CPO) vehicles has increased to 38% - up 3% over 2002. Consumer awareness of CPO programs also continues to increase. 57% of all used-vehicle buyers are now familiar with the programs before beginning the shopping process -- up from 54% in 2002.