AIRMATIC Compressor Unit Mercedes S-Class W221 A2213201704 — Air Ride Compressor Replacement This is the Mercedes-Benz air suspension compressor (compressor, compressed air system) for the S-Class (W221, 2005–2013) — the AIRMATIC air ride compressor that keeps the air springs pressurised on the flagship saloon. OE 2213201704 sits in a 15-number family (221 320 07/09/16/17 04, coded variants such as 221320070480 and 221320160480, plus the full A-format set) — one SKU backs