Very Unhappy With the Service Department.\n\nRecently I had some problems with a S550 that would not start.  I had the car towed in to the Henderson location on a Monday and was advised that most likely I had a faulty key but since the keys were so expensive they would attempt to diagnosis the problem.  Never received an update so I followed up with the service advisor and told yes I needed a key.  Each day I had to follow up with my advisor as I never received any updates, yet the advisor was able to tell me a laundry list of things that I should replace that had nothing to do with why the car was in the shop.  On Friday I was told the car was ready for pickup and the new key worked but now the interior lights would not turn off and that I needed to replace the circuit board for $1600.  I was advised it would not be wise to pick up the car unless the circuit board was replaced.   I asked that they just unplug the lights which they did.  I picked up the car and paid the $600 for a new key.  Got home plugged my lights back in and guess what they worked just fine and have not had a problem since.  But here is where the real problem begins, my key that just cost $600 did not work.  Took the car to the Sahara location and they were able to diagnosis the problem it was a faulty EIS which I replaced and have had no problems since.  Went back to Henderson and asked for a refund on the key as clearly the key was not the problem and they did not correctly diagnosis the car, was advised that there was nothing they could do, nor did they apologize for giving me back my car only to have the key not work once the vehicle returned to the house.  Nor were they able to give an explanation on why the Sahara dealership could fix the problem when they could not.  For these reasons I would strongly avoid not taking your car to the Henderson dealership.