If reseating the connectors really does help....You might try a product that VW endorses for enhansing electrical contacts.
STABILANT22A.

http://www.stabilant.com/tech04h.htm

This cures many low amp/voltage resistence problems with late ECU's.

BTW..It's about $68.00 a 15ml bottle. I'm on my second bottle after 15 month in workshop use.




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