I have put three of these things in. I think there should be a recall issue with them. Both this and the other air pump went. Its been like $850 to replace. Now the dealer is replacing it a third time.
On top of that the dealers are pretty crooked. I had to replace the entire gas tank because the sensor was bad. That was like $1900 at 25,000 mile. I wrote a letter to Smart USA and they covered the labor. I don't trust smart dealers as far as I can reach in front of me. They seem squirley and awfully snobby. I had the dealer in Utah tell me " we are not in the habit of giving Mercedes loaners to Smart car owners." I was like seriously? I mean Phoenix/Chandler has loaners for $15. I guess the Utah dealer is the middle of nowhere. Still it was rude and bad customer service. If it wasn't for that fact that I love the car I would already have sold it and sworn off Mercedes. Great car overall, just poor service implementation.