-Combustion engine sporadically fails to start. -Combustion engine can no longer be started. -Start/Stop function is sporadically unavailable (READY displayed in yellow in instrument cluster). -Start/Stop function fails to function properly in dangerous road conditions — e.g., when pulling into an intersection, in stop & go traffic, when proceeding at a stop light, etc. -This is the second time this major incident has occurred; this was repaired in December 2020 under manufacturer warranty. The Power Electronics (Electric Motor) Control Unit was replaced. It is clear this is a recurring failure affecting this vehicle. ***Campaign No. 2012080004, November 2012 addresses this exact issue — for this exact car (i.e., Mercedes-Benz S 400 (221.194) V6-3.5L (272.974) Hybrid. However, that Recall Campaign is covers Model Years 2010-2012, but fails to cover MY 2013, which is exactly the same as the covered vehicles. This Campaign instructs to Check/Replace the Power Electronics Module, which is the part that my local Mercedes-Benz dealership has advised has failed and needs to be replaced.