I see your thinking, with 1st and 3rd both 'push the stick forward' selector positions, you could have a problem with the selector cable ends. Its worth checking them, you can see the gearbox ones from the engine bay and for the gear stick ones you need to remove the centre console to access the gear selector.
The Citroën Ami is wildly different, certainly, and undeniably a quirky take on getting around in towns and cities that are increasingly dominated by e-bikes and e-scooters. It also dividesFour month ago I bought a new Citroen C3 Picasso Exclusive and I must admit that it is an excellent car for my needs. I have a disability so appreciate the automatic box and cruise control. However, the gear change is very dodgy. It gives the impression of a stall and is nerve racking when you need more power to climb a hill. I have taken it up with Citroen who say this is a "feature of the related to not being able to select reverse gear on a 2007 Ducato with 2.2litre motor (which I assume would be the same powerplant/gearbox as used on a 2007 Relay). As Kennyd has suggested, the first thing to check is the linkage between the gear-lever and the gearbox as (hopefully) that’s where the problem is likely to lie, rather than Iu3eeyW.
citroen c3 gear selector problem
