Hello Together, have a 451, 85hp, built in 2007 with approx. 71TKm. Now the reverse gear does not go in with running engine any more. Error code P0805. Everything is running forward. I looked at the posts here in the forum. I initially suspected the actuator and dismantled it and opened it. Looks like everything is fine. So screwed up again. Because the smart was standing on ramps, I put the ignition on the reverse gear. “R” also lights up. After easy release of the handbrake I noticed that the smart doesn’t roll down and therefore the R-speed should actually be in it. Is there another sensor that could block the insertion of the running motor? With running engine it sounds like if you want to insert R, as if a mechanism is surging and something is not coming to an end. Does someone have an idea that I can still test and what could possibly be responsible for the error except a worn-out clutch? Many thanks for your feedback already in advance.