As said more than likely going to be selector cables judging by the gears that dont work all need the same movement (gearstick pulled towards rear of car)

Pretty easy to swap for a replacement set, hardest part is getting them out the hole under dash then back in again. Will be difficult on a jack so try and use a ramp if you can!

Cables will come out of the car then onto the front of the gearbox under a black cover if there anything like the normal focus engines.