Two documented small-item issues: a manufacturing flaw in the R170 taillights caused frequent shorting and light failure, with MB offering free replacements/recall work (many done around 2007); and replacement key fobs are costly and increasingly scarce, with owners quoting $200-$250+ plus programming and dwindling MB inventory.
Taillight recall and expensive/scarce key fobs
Mercedes-Benz SLK / SLC · ownership