I had this error on my Dell C1760nw, i had been trying to fix why it was printing light grey instead of black and after cleaning sensors in back and reseating toners and updating firmware and uninstalling etc i got fed up and used the old faithful. Tipped it on its side so the toners were at the top the picked it up about 2 inches and dropped it a couple of times, turned it on it made a lot of grumbling noise but you know what it cleared the error code and made it print in black again
might sound daft but i think there was a blockage and it cleared it