The Consumer Financial Protection Bureau (CFPB) has expanded its investigation into U.S. auto lenders, issuing subpoenas over the sale of extended warranties and other financial products offered to borrowers. Lenders worry that the probe could hurt the booming car-loan industry.

Car dealers offer add-ons, such as extra insurance, as a way of increasing profits. This move is part of the CFPB’s continuing efforts to rein in what it worries are questionable auto-lending practices.

The CFPB has issued subpoenas to both banks and financial sectors of auto makers. It has asked several dozen questions and requested data on auto lenders’ practices, said Alan S. Kaplinsky, an attorney with Ballard Spahr who represents financial companies.

"The CFPB is on the warpath when it comes to add-on products," he said.

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