engine output required no mechanical upgrades to the car. In 2021 a used example was sold for $111k. Suspension: Airmatic & Active Body Control The W220 was available either with air suspension which is a semi-active/adaptive suspension, or hydropneumatic suspension which is an active suspension, rather than the more common mechanical "springs and shocks" on most passenger vehicles. The car had an electronic stability control program and automatic slip control. Airmatic Airmatic, or AIRmatic stands for Adaptive Intelligent Ride Control and was not just an air suspension, but also electronic and software control system that actively adjust the level of dampening. This allows, for example, the car to automatically lower itself down at high speeds and keep the car balanced despite loads inside the car. The car can also be manually controlled to raise the car up if going for example over rough roads. The standard W220's have Airmatic. The Airmatic main components are an air-pump, airlines going to each wheel, and four air-struts. The air pump is located in the front diver side behind a splash guard near the wheel. Mercedes-Benz has also improved and changed the Airmatic pump over the course of time. The AIRMATIC struts are controlled by the N51 Air Suspension Control Unit (N51) and there is also a level sensor that tells the level. Airmatic allows a W220 to be lowered or raised by about 2 cm, for example, it lowers at high speeds for a lower center of gravity. The Airmatic system was supported by the ADS, active damping system. The lower control arm in the previous S-Class was switched to a spring link and torque strut. On the instrument cluster multi-function display, the AIRMATIC warning message says "AIRMATIC", "VISIT WORKSHOP!" with an graphic of a car with a little arrow pointing up when it may have issues. Active Body Control Some models had a hydropneumatic suspension system, Active Body Control or ABC. The ABC system on the 1998-2005 S-Class used hydropneumatic suspension struts. ABC was standard on the S 55 AMG (supercharged) and S 600 (biturbo), while being an optional upgrade on other S-Class models. Features As with each new S-Class, the W220 was technologically advanced at the time of its launch, bringing in new innovations such as Airmatic air suspension, Active Ventilated Seats (which used miniature fans in the seats to move air through perforations), keyless entry and ignition, Distronic: the first