I have a four year old Mercedes-Benz SLK with 19,700 miles on the clock. I've owned it for a year and it has been covered by a warranty, which has now just expired. So far, it has had a new RPM sensor, NOx sensor, heater box (involving removing the dashboard) and aerial (which involved a new windscreen). These faults have all occurred within the last two months. I'm very disappointed that these faults occurred in a marque I'd perceived to be of high quality. Have you heard of similar issues in a car of this age and is it worth taking out another warranty or have most of the major things likely to have gone wrong already happened?