peugeot 807 2lt auto faults?

about 3 months ago we bought a 2006 807
the day we bought it it went straight back as the turbo needs resealing (garage paid for that) then it was the break switch (we paid)then the additive level was low (we paid)then the starter motor went(warranty company paid) then we needed a new battery
now the fan wont always stop running and after a few hrs it sets the alarm of and drained the battery we bought the fan switch but can not find where it goes
and now we have the de-pollution fault on ??????
we also have tyre pressure not monitored but im not bothered about that as we had to have a new valve fitted and i wouldn't pay for the dear 1