Mercedes-Benz W221 Rear Airmatic Air Suspension Strut AS-2821 - Used Original Parts
RM 800
Condition: Used (Original)At a Glance
- Mercedes-Benz W221 Rear Airmatic Air Suspension Strut AS-2821 - Used Original Parts
- Part number: AS-2821 / AS282100A1001503 / 29-7494 / 29-7017
- Fits: Mercedes-Benz S-Class W221 · confirm by chassis number before ordering
- Used Original · tested working
- RM 800 · final quote via WhatsApp
- M.S. Motor · Kuala Lumpur, Malaysia · ready stock
Diagnosis and Common Symptoms
The W221 S-Class relies on Airmatic air suspension struts to maintain ride height and control damping at all four corners. When a rear strut begins to fail, the air spring bellow typically develops cracks or the internal damper loses its seal integrity, resulting in a slow leak that the compressor cannot keep up with. Common symptoms include the vehicle sagging noticeably on one rear corner overnight, a "Visit Workshop Suspension" or "ESP/ABS Fault" message on the instrument cluster, and the air compressor running excessively or continuously trying to compensate for lost pressure. Fault codes typically logged in the SBC/ADS module include those related to right or left rear level sensor deviation and air supply system pressure loss. Drivers often report a clunking or knocking noise over bumps due to a failing internal damper piston, along with a harsh, unsettled ride quality that indicates the strut has lost its damping characteristics entirely.
Introduction
This is a Genuine Used Mercedes-Benz W221 Rear Airmatic Air Suspension Strut, pulled from a donor vehicle and thoroughly Tested for air-tightness, damping performance, and structural integrity before listing. Every unit undergoes a pressure hold test to confirm there is no bellow leakage and a physical inspection to verify the damper rod moves smoothly without binding. Sourcing a Genuine Used strut is a cost-effective way to restore correct factory ride height and damping behavior without paying new dealer prices. All units are cleaned, inspected, and ready for direct installation.
Product Details
- Brand: Mercedes-Benz
- Model Compatibility: W221 S-Class (S350, S400, S450, S500, S550, S600)
- Part Name: Rear Airmatic Air Suspension Strut
- Part Number Reference: AS-2821
- Condition: Genuine Used (Tested Working)
- Notes: Pressure tested for leaks, damper stroke checked for smoothness, air fitting and connector inspected for wear, no signs of bellow cracking at time of testing
Frequently Asked Questions
What are the early warning signs that a W221 rear Airmatic strut (like AS-2821) is failing?
The most common signs are one rear corner sitting lower than the other after the car has been parked overnight, the compressor running more frequently than normal to maintain height, and a "Suspension Fault" warning on the dashboard. A clunking noise over bumps usually indicates the internal damper is worn, not just an air leak.
Part price does not include installation. Our workshop can install for you, labour is charged separately and confirmed with you before any work starts.
We cannot diagnose your car over WhatsApp or photos. Not sure this part will solve your problem? Come for a workshop check, diagnosis fee RM180. If you proceed with the repair using our parts, the RM180 is offset into the labour charge. If you decide not to repair, only the RM180 applies.
All parts are tested and guaranteed to work. Whether a part solves your car's problem can only be confirmed by diagnosis.
Shipping: from Kuala Lumpur, West Malaysia ~RM50, East Malaysia ~RM80 (estimate, confirm via WhatsApp). Delivery 1-2 working days in secure anti-static packaging.
Warranty: 30-day exchange for control units, engines, gearboxes and other major parts; 14 days for small parts. Claims require proof of installation by a qualified workshop. No warranty for items opened, modified, or damaged by wrong installation.
Prices vary with stock and part condition. Final price via WhatsApp.
Original Parts
Quality European Originals
Fast Delivery
Nationwide Shipping