The end of a Federal Reserve program that helped unlock credit markets is spurring sales of asset- backed bonds with relative yields five times wider than on debt secured by car loans. The expiration of the Fed’s Term Asset-Backed Securities Loan Facility is driving companies to sell bonds tied to loans that would otherwise require higher yields. Borrowers are offering bonds backed by subprime auto loans, mortgage-servicing payments and assets that have proved hard to sell after the worst credit seizure since the Great Depression. “What we are seeing in the last couple of rounds are issuers in non-traditional asset classes and weaker issuers looking to fund as much as they can before the window closes,” said James Grady, a managing director at Deutsche Asset Management in New York.