The 407 is a brilliant car, you get a lot for your money and its a smooth comfortable drive. I once did a coast-to-coast in mine, middle of summer, endless traffic problems going to Scarborough, but I got there relaxed and not tired in the slightest.
Your best friend will be someone nearby with Peugeot Planet and Lexia, as they have the same equipment that dealers use but charge only "beer money" to run a diagnostic check. Some of these people aren't amateurs either and know their way around the system.
I manage a map of owners:
maps.google.com/maps/ms?msid=214397633218647067111...e
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