NHTSA Complaint #11435904 — 2018 MERCEDES-BENZ S560

Walk Home Condition -I purchased a 2018 CPO Mercedes-Benz S560 on 8/20/21 from Knauz Continental Autos in Lake Bluff, IL. On 9/25/2, at approx noon, I was driving the vehicle and the engine light came on, the throttle/engine felt sluggish and not responsive. The engine felt very out of balance shaking the entire care when the gas pedal was pressed. 5 mins later in heavy traffic, I stopped at a light, the engine started violently shaking and stalled. I shut the car off and tried to start it over a 5 min period. I was able to limp the vehicle to a local Mercedes dealership (Bloomfield, MI). Could only operate the vehicle below 25 MPH without violently shaking. The dealership was only 1 mile away. That dealership was able to quickly check codes. When I arrived the engine light went out and no codes where set. The assistant Service Manager told me that it looked like cylinder 4 was misfiring, but no code set. He told me that if it happens again, shut the car off and it should reset. I left the dealership around 1pm and continued driving. The issue had stopped. Approx 5 hours later, after driving for 3 hours, the same issue happened again about 5 miles from my home. The vehicle stalled multiple times and I finally got it running and limped the vehicle home at 20-25 MPH. The engine fault light stayed on this time. I let the vehicle sit in my garage on 9/26/21 as I was afraid to drive it anywhere. On 9/27/21 I drove the vehicle to the dealership close to my house. (Rochester Hills, MI) When I submitted the vehicle I was told that because I didn't have an appointment, they weren't sure if they could look at it that day. Service Rep called and said that the vehicle set a code (P030485). They said it would probably go away so I picked it up. Same issue occurred on 9/29/21 after driving for 25 mins. Had to limp the vehicle home again at 20 MPH. I turned the vehicle back into the same dealer on 9/30/21. I have zero visibility on a fix and next steps.