Could be anything. lack of fluid (not sure if electric PS has fluid?) Dodgy wiring, bad steering rack. If its electronic then its likely to be connected to an ecu or control unit. First step I would suggest is plug it in to planet and see if there are any error codes.
the planet map is a list of members with Peugeot planet diagnostic. Its a very good tool specifically for Peugeot to diagnose problems. A lot of members will do it for nothing, some for beer tokens and some for the cost of the fuel. The only way you can find out is to ask members that are close to you. Hence the planet map.
Out of interest what colour is the PS fluid? Should be a bright red. Best thing you can do is read the handbook and use the search function on the forum. There is so much useful information on here. There is bound to have been someone with a similar issue. May suggest a few things you could look at. But if your wanting to stick with the Peugeot then investing in a planet diagnostic for your self is a good investment in my opinion. Generic code readers don't work on these cars only planet will. There not that expensive either now. have seen a couple of posts recently which have links to kits sub £100. For what planet does it is worth every penny.
Its certainly worth investing in if you want to keep the Peugeot. If the fluid is red/black then may be worth changing it. I have no idea how you would go about that. A Haynes manual wouldn't go a miss either. can be handy in helping you figure things out. saying that sign up for a free account on servicebox. big database with part numbers on, can be handy when your not sure which part you need. You can also get a subscription with them and get all the technical drawings.
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