When trying to pass at 65 Mph, the car would not downshift or accelrate. It operates fine with slow acceleration. Also, the left window will not return to up position after top is raised.
Tiptronic will not downshift and car jerks. on 2006 Porsche Boxster S
This question may be best posted to a Porsche Boxter specific website forum as there are some owner's that are very technically knowledgeable or may have experienced this problem before.