I have had a 406 for 6 months and found your boards whilst searching for answers to a few of the niggles I've had with my car since I got it. Nothing major, overall I am seriously impressed !
This is my 406 1.9TD (the pics are from the trader page when I bought the car, I don't have any others!)



I picked it up for a grand with 75k on the clock. It's been wonderfully cared for and is in great condition for the age, with pretty low mileage by comparison.
Unfortunately I don't know much about 406's in general other than it's great on fuel and fits my fishing tackle in the back with ease.
I see lots of references to d8 and d9 but I don't know what my model is? I have got a few questions to ask so maybe one of you helpful chaps could give me a bit of a hand identifying the car before I go asking about other things...answers may depend on my model and I don't want to risk looking a berk ;)
cheers
Baggie