Don't let smt codes scare you, as sometimes due to the clutch slipping a few sensors have issues or need a clean. I'm going through it and confident change clutch check sensors, change if needed!
As soon as smt throws a code everyone says do a manual swap or 2zz it but I love my smt, not such a scary thing once you understand it!
Best of luck with your car and hope you enjoy it as much as most of us spyder owners.
Just a question, how do you know it's a ttr mr2 spyder? Does yours have a plate that states it? I'm interested in knowing what the differences are!