Rocker cover gasket was replaced 3 times during my ownership as it was diagnosed by Peugeot to be the culprit for an oil leak.
Brake pads 'jumped out' of the callipers on the drivers side- luckily I was driving slowly and managed to stop the car with the handbrake.
Front tyre wear was atrocious- 10,000 miles was about par.
Radiator hose wore out.
Brake flexi-hose needed replaced.
Front fog lights became non-functional after the connections became corroded.
My 405 GLX was a very flash car when I bought it and it came equipped with plenty of goodies; Alarm, remote central locking, electric windows, Air-con and sunroof! and big comfy seats.
The engine was a very quiet unit that was more than adequate for pulling the car even though it was the smallest in the range, though I suspect it did have to work hard as it rarely managed more than 35 mpg which is 1.8 territory. It was flexible and powerful though perhaps the gearing was a little too tall to release it's full potential.
Ride is very good and handling is also good for a car of it's size, it's not going to out-corner a Saxo, but it doesn't do anything to cause alarm. the rear end is very light and if you get too enthusiastic you can spin the car despite it's front-drive layout though this is only really applicable in the wet.
Brakes are adequate though not of the same standard as it's cousin; the Citroen Xantia, the 405 would have benefited from having rear discs too.
Interior is very comfy and the GLX trim is also quite sporty aswell. it's good to see Peugeot didn't bother trying to tart it up with that fake-wood.
I found running costs high for a car of this size a full tank of petrol was nearly £50 and you'd get little over 400 miles from it.
It is a great family car and there are loads of them out there, and they are capable of intergalactic mileages.
Owning the 405 was pleasurable and in the end I was sad to see it go.