Dude, where are your cars?

The state Office for Persons with Developmental Disabilities did such a lousy job keeping tabs on its fleet of vehicles that it lost track of two vans for years, a new audit of the agency found.

A review of four city OPWDD outposts by the office of state Comptroller Thomas DiNapoli uncovered a slew of sloppy fleet-maintenance practices — including the disappearance of the two vehicles.

“Auditors tried to physically locate 136 active vehicles. They could not find two,” said the report. “Officials said they have been sold as surplus years earlier, but they had no documentation to support that.”

One of the vans, a Chevrolet G-20, was eventually found to have been sold at auction in 2005.

The other, a Chevy ­Express, was withdrawn from surplus in 2009. Its license plate was reported missing in 2015 — and it couldn’t be found by the Comptroller’s Office.

The OPWDD eventually found it sitting on the lot of one of its offices.

Another seven surplus vehicles that were supposed to have been auctioned off in December 2016 were also found gathering dust on a lot.