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The 1995 buick is a bit of an oddball with the on board diagnostics. It is an obd1 system with an obd2 connector and takes a speciial scan tool to connect to the computer. From the symptoms you have described, it sounds like you have a failing vehicle speed sensor on the transmission. This sensor is located on the transmission, near where the passenger side axle exits the transmission.
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2003 Jetta left rear window blue plastic part of the