I think I will do that on my 30,000 servis this month or this spring when it warms up.
My car just crapped out at 65,555 miles (08 Passion). I have had the air sensor issues and continual error code, though smart couldn't find anything more (after $1300). Now I died while I was driving - a thump, a couple of lurches, and error P0805 and P0900. I'll have to look up retraining the transmission, but it was towed to a local shop for now.Result! And it's amazing!
I got a call from my rep at the Smart Center. Apparently the issue was twofold. First of all, I've had a recurring problem with my air-pressure sensors. And somehow, the computer seems to have gotten tripped up by this. Secondly, I needed the most recent software update.
When both of these were done, I got the car back, and it seems to be driving fine.
Total cost: two different diagnostics, testing the car, etc: $140. Coulda been MUCH worse.