Power Steering failure is very common on all 207 models, the steering can start off intermittent but if left will always lead to total failure causing the steering to become very heavy in both directions, the steering can also be heavy one way and self steer causing the vehicle to pull to one side when driving down the road.
The common faults that will indicate that your electric power steering rack is faulty are:
1. Heavy steering in both directions.
2. Intermittent loss of steering.
3. Complete loss of power steering.
4. Self steer (Pulling to one side).
5. Heavy steering one way.
46 Power steering light illuminating on the dash.
most of the time the fault lies with the steering rack and the whole unit has to be replaced
but before doing that just check that the battery connections are clean and tight and the battery itself is in good condition as the electric powr steering systems take a lot of current