Mercedes Benz S420 owners have reported 1 power train related problems since 1996. Table 1 shows the 1 most common power train problems. The number one most common problem is related to the vehicle's power train (1 problem). For details of each of the problem category, use the links in the table.
| Problem Category | Number of Problems |
|---|---|
| Power Train problems |
Electrical wiring harness using soy based insulation degrades thereby allowing wires to spontaneous and/ or intermittent shorts. This has caused extremely dangerous driving situations. Very difficult to troubleshoot unless and until one discovers insulation failure. This has been and is widely known to be a problem with this era of cars. Extremely bad engineering decisions were made. Very serious and potentially dangerous conditions. Mercedes should be held accountable for malfeasance and a recall should have been made. I bought the car new; had service only at the dealer; was never notified of the problem. I have older cars with more mileage which do not have the problems I have with the mercedes. Very disappointing. Will never buy another mercedes; all hype!.