Jetta 99 Aut Board

Hello good morning, I would like to know if anyone knows how to fix a Jetta Board auth.

Well, take that part of the board, and check all connections.
that there are no loose, or peeled cables
or some false contact.
luck

I think the same disassembles the board and clean it checks what cables and connectors, the earth and cylicone can be very harmful

Something similar happened to me. It is the "Crazy Board" syndrome. You must disassemble the board and set all connectors ...
greetings.

Disassemble the board completely and check in the scheme if you notice a cold welding, that is, it looks like it also checks whether any cable is released in the temperature or oil sensors or sees if any connector is disconnected in the engine that can be creating a false reading of the sensorred signal that the boards are also centralized and need the fluid information of everything.-