I've had my car since Monday evening - drove 200 miles and today on my way to the dealership to get my interior/exterior protectants, I got my first warning light. It was for tire pressure, not being able to detect sensor. The dealer told me that although they checked everything out and were able to clear the warning, they will go ahead and replace the sensors with hopes that I don't have this problem again (or at least so soon). It was a little bit discouraging, but luckily I was taking the car in anyway for other things. So, now I get to drive a C300 for 1.5 days.