
There is a 6 digit code painted in yellow on the strut top, first 4 numbers relate to date, second 2 to the plant it was built at (stole this info from Plods post

81 = Poissy France
82 = Villaverde Spain
83 = Ryton UK
85 = Vesoul France
87 = Eiv Poissy France
88 = Mulhouse France
89 = Sochaux France
U5 = Pininfarina Italy
U8 = Sevel Italy
U9 = Sevel nord France
UT = Kolin Czech
CA = Aulnay France
CJ = Rennes France
FV = Vigo Spain
G8 = Creil France
G9 = Gennevilliers France
RE = Rennes France
I put the code into this :
http://toby.or.tv/build_col_eng2.html
My peugeot 406,2.0 turbo version has the next code: 734589, after decoding it, meens she was born : Thursday, 19 December, 1996, Sochaux,France.