Cops busted a boozy FDNY firefighter who was found sleeping in his car Sunday on the Belt Parkway in Brooklyn, police sources said.

Firefighter Lenzell Ross, 28, was arrested on a charge of DWI just before 2:30 am. on the highway near Pennsylvania Avenue in East New York, according to police.

Ross joined the department over the last two months, according to payroll records.

The FDNY did not immediately respond to a request for comment. Ross could not be reached.