When depressing the throttle, occasionally there is no response form the engine or a significant delay coupled with erratic engine revving behavior. When this happens the car has no drive power, but power brakes and steering are unaffected. The engine sits at idle speed. This has happened on multiple occasions when in or crossing traffic. The issue may present and then disappear after 15-45 seconds with no other action being taken.

- Fort Mill, SC, USA

I was pulling out of a parking lot onto a highway with a posted limit of 55 mph. As I pulled out onto the highway the gas pedal just stopped working. The car was on but it just wouldn't go anywhere. A vehicle coming from my left at a high rate of speed had to put on it's brakes in order not to strike the driver's side of my door. It came within 2 feet of my vehicle. I turned off the car and restarted it. When I restarted the vehicle I turned off the "eco" button and drove a couple of miles back to my home with no problems. Note....I have no idea if the "eco" button has anything to do with it. The vehicle has been at the Mercedes dealer in fort worth since Saturday January 30th. They tell me they can't find anything wrong with the vehicle. I'm not sure what they expect me to do about it. The car is unsafe to drive.

- Granbury, TX, USA