The Office of Defects Investigation (ODI) opened this investigation based on two reports from the same consumer alleging the center front adjuster (CFA) on two different Dorel Vantage child seats would not hold the harness securely.The consumer reported that after adjustment of the harness the CFA did not close completely, allowing the harness webbing to slip through the CFA.ODI is upgrading this investigation based on information provided by Dorel and additional consumer reports on other model Dorel child seats.