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In the process of troubleshooting a Tiptronic transmission issue (2000 Boxster Tiptronic, 92,000mi), of which you can read the history on this post: http://www.renntech.org/forums/topic/28941-serious-2000-boxster-problemplease-help/ To summarize, after losing all power to the wheels on Sunday, and the indicators flashing "D - 4", had the car towed home and I changed the ATF (following all proper procedures...I'm unfortunately quite familiar with that process). Still no power to the wheels (car is on jack stands, rear wheels are off the gound), and no "kick" into gear that I can normally feel when putting it into R or D. After reading some posts here, I unplugged the battery overnight to reset the ECU (seemed to have fixed others with similar problems). After replug on Tuesday, I had some power in D, minimal to no power in R...progress at least! Try again yesterday (Wednesday) and have good power in D (seemingly normal), more power in R (possibly normal), and feel the normal "kick" into each gear...promising! Switch over to M and no power...Arrrgh! Based on this, I believe this is all being caused by an electronic problem in the transmission control board(?). Not being very familiar with the Tip, I have what may be some elementary questions based on my experience yesterday: 1. In D, without the brake pressed and no gas pressed, both wheels initially spin (speedometer shows 10mph), but after ~30s the passenger wheel stops turning, while the driver's side wheel continues (speedometer still shows 10mph). Normal? Or is there a problem with my Diff? 2. In D, accelerate to 30-40mph, and car shifts into 3rd, sometimes 4th gear very smoothly, seems normal, both wheels spinning. 3. In N, without the brake pressed and no gas pressed, both wheels spin forward (speedometer shows 6mph), same thing happens after ~30s as mentioned in Q1. Normal? 4. In M, no power to wheels as mentioned above, but speedometer shows gradually increasing speed from the 10mph it showed in D, even though both wheels have stopped moving. WTF??? Since I had power in D, took it off jack stands and drove it out of the garage, made a quick loop at the end of the driveway and drove it back up and into its spot in the garage. My driveway is reasonably steep (~15deg) and everything seemed fine in that 1/10th of a mile. Waiting for a Durametric to arrive before I drive it too much more to see if it tells me anything important. I'll post codes as soon as I have them. Thoughts? Ideas? Help!?!