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I purchased a used Smart Pure cdi (2006) with 88.000 km. It was jerky to start and then one day would not start - as if locked. Towed it to the dealer and found that the SAM had corrupted due to water affecting the top multi-pin plug. The SAM had to be replaced. I also had the 90.000 service done at the time. After spending a small fortune the car is running smoothly and as expected.
What I did learn from this is that water can filter down from the left front grid (where you access the air intake) and can eventually get on the SAM. I hope to prevent this in the future when I placed a shower cap over the SAM to divert any water around it.
I noticed that others have been complaining of burned headlamps on the left side and would suggest that maybe water could also be the reason for that problem.