Josh Gordon -- Welcomed Back to Sling Cars ... Again

They say when God closes a door, he opens a window -- and for Josh Gordon, that door is being an NFL star receiver ... but the window is selling Fords in Randolph, Ohio.

Gordon is facing a possible one-year suspension for allegedly failing another drug and alcohol test.

But TMZ Sports has learned he's already got a plan B, if he wants it -- his old job hawking cars and SUVs for Sarchione Auto Group is once again available. If you remember, Gordon worked there in 2014 during his 10 game suspension ... and Senior Sales Associate Mike Sabatine says the dealership would love to have him back.

Despite Josh's repeated troubles with pot and booze -- Sabatine says he never saw Josh drink or smoke, and says the guy he knew busted his ass on the job "just like the rest of us."