Leonard Fournette's car troubles seem to be officially behind him ... the Jaguars star just copped a plea deal in his car wash arrest case -- and he won't have to spend any time behind bars for the incident.
As we previously reported ... Fournette was busted last month after cops say he was speeding with illegal tint on his windows in South Florida.
When cops pulled him over at the Easy Breezy Car Wash in Jacksonville ... they learned he was also driving on a suspended license and had a warrant out for his arrest stemming from a previous traffic violation -- so they cuffed him.