This Mercedes-Benz S55 AMG presents a unique opportunity for enthusiasts and DIY mechanics alike. Having been stored indoors for an extended period, this W220 chassis S55 recently returned to the road, showcasing both its inherent strengths and areas needing attention. A recent drive confirmed the robust nature of this machine, with a remarkably smooth engine and functional climate control. However, like any vehicle of this age, particularly one with the sporting pedigree of an AMG, there are quirks and features requiring investigation and care.
Initial observations reveal a blend of working systems and minor malfunctions, typical of the W220 generation. The navigation system, for instance, appears to be experiencing media reading issues, potentially stemming from a dirty laser lens or media degradation. The original map media is still present, suggesting the issue hasn’t been addressed by simply swapping components. Similarly, the Alpine 6-disc CD changer is currently non-operational, refusing to release its magazine. While these are inconveniences, they are often resolvable with targeted troubleshooting and component cleaning or replacement – common scenarios familiar to W220 owners.
A more pressing issue is the soft-close door system, which was functional upon initial acquisition but has since ceased operation. This points towards a likely problem within the Pneumatic System Equipment (PSE) system, potentially a blown fuse or a system leak. Diagnosing and rectifying PSE issues is a well-documented process within the Mercedes-Benz community and often involves systematic fuse checks and leak detection. The owner’s philosophy of preserving Original Equipment Manufacturer (OEM) components is commendable and aligns with the spirit of maintaining these sophisticated vehicles. Rather than opting for aftermarket replacements, the focus is on restoring the factory systems to their intended functionality, a rewarding endeavor for any classic Mercedes enthusiast. Even the minor pixelation on the head unit display is seen as a restoration opportunity, favoring an OEM display replacement over a modern, but potentially less integrated, aftermarket unit.
The instrument cluster presents a more significant initial concern. Upon purchase by the previous owner, the odometer displayed “——,” indicating a potential coding or communication issue. This also masked certain vehicle options, such as DISTRONIC, and affected the telematics system, rendering the TEL, NAV, and AUDIO displays inactive. The previous owner was informed that “programming” was needed, a task often perceived as straightforward but in reality requiring specialized tools and knowledge. It’s plausible that the local dealership route proved unfruitful, leading to the issue remaining unresolved. However, with the correct diagnostic tools and expertise, the instrument cluster was successfully recoded to the Drive Authorization System. This rectified the odometer display, pulling data directly from the Electronic Ignition Switch (EIS), and correctly configured the telematics, DISTRONIC, and Dynamic Seats options. This successful intervention highlights the importance of specialized knowledge in diagnosing and resolving complex electronic issues within these vehicles.
The presence of DISTRONIC, initially unnoticed due to the instrument cluster issue, was a surprise. The discovery of distance control buttons and the missing grille cover hinted at a prior incident, corroborated by a CarFax report detailing a collision with a deer. Interestingly, the vehicle is currently running on square tire setup – 245s on all four corners – deviating from the factory staggered configuration. Despite this, traction remains surprisingly good, even under spirited driving. This raises questions about potential Engine Control Unit (ECU) tuning, as the vehicle exhibits a level of responsiveness suggesting enhanced performance. While unconfirmed, the car’s behavior hints at possible modifications, further adding to its intriguing nature. Speculation also arises regarding the presence of a Limited Slip Differential (LSD). The assertive power delivery, reminiscent of LSD-equipped vehicles, contrasts with the expected Electronic Stability Program (ESP) intervention in open differential cars. The AMG V8 Kompressor engine delivers power with immediacy, and the lack of noticeable wheel spin or ESP intervention from a rolling start further fuels the LSD theory. Diagnostic checks with tools like Diagnostic Assistance System (DAS) reveal that the supercharger clutch is constantly engaged, adding another layer of intrigue – potentially indicating a fixed supercharger pulley modification, common in performance tuning for these engines.
Visual inspection suggests that the rear of the vehicle and doors retain their original paintwork, with consistent panel gaps and seemingly untouched model designation emblems. However, the front end, particularly the hood and fenders, likely underwent refinishing post-deer collision. Minor discrepancies in hood and fender gaps are present but appear easily adjustable. A minor inconvenience is a slightly misaligned passenger-side hood latch, requiring manual assistance to fully release. While lubrication proved ineffective, this is likely a minor adjustment issue rather than a significant structural problem.
In conclusion, this S55 Mercedes presents itself as a compelling project car. It possesses a potent AMG engine, functional core systems, and intriguing potential modifications. Addressing the identified electronic and minor mechanical issues offers a rewarding path to restoring this vehicle to its full glory. For someone seeking a W220 S-Class with character and untapped potential, this S55 Mercedes warrants serious consideration.
