nycpr
Where you said .6L as the motor size, is this a G&K Smart, EU or a Ca Smart?
Did you do the code reading because you having a "Driving " problem?
If a driving problem, what are the problems (need a few details here)?
When did it start, did it all start at once, and was there an evet when it all started ( hit a snow bank, dog pee'ed on back tire, etc).
I too would be looking for wet, loose, dirty connectors, or maybe even a transmission ground.
Let us know
ASM