I just purchased a 95 s320 with 109000 miles on it. When I purchased the car, the key was not in its best condition. I was using the key and all of a sudden the engin stop turning over with the key. We just assumed that the key. The Mercedes dealer purchased me a new key and we tried starting the car with the new key. NO LUCK!!! We had the battery check and this is not the problem. The starter is not making any clicking noise. Actually, the only noise we hear is coming from the fuel injectors....Any suggestions on what we can do next?

 

Sounds like you need to find another shop. While the ignition switch or lock cylinder may be the culprit, a competent shop should be able to diagnose the problem before installing parts. Good luck.