There is a another post from the same chap (Steve) in the New Owners section where the car he is looking at is a "low" miles (28,000) 2009 facelift X-150 with a sketchy service history and these 2 x faults showing - from a private seller, meaning nil warranty. Asking price is £16.5k and whilst the Pedestrian System can be the front sensors, my experience is that the explosive cartridges are the most common fault - they need not have deployed (making the bonnet unable to close) but they do have age related deficiency's that requires them to be replaced.
For that price and poor presentation / service record, I would walk away, there are plenty good examples available with more protection.
N6 JMX