Welcome to the 406 Owners Club (406oc.co.uk and pug406.co.uk). If you havn't registered, you can post in here, and find out what the site is all about!
This forum is pretty good for technical help and guidance, although it's a bit quiet of late....
Have a peek through the Knowledge Base on the home screen for possible solutions, otherwise just post up whatever questions you have and we will try to help you get to the bottom of it
Also, please take 5 mins to add your location to your profile then maybe someone local with diagnostic equipment can swing by.
Kelv
2003 2.2hdi estate - mine 1998 Volvo 940 auto estate - also mine 2019 Citroen C3 something - the wife's PP2000 user, can help with faults / diagnostics in the Bournemouth area.