Mercedes-Benz W221 Rear Airmatic Air Suspension Strut AS-2821 - Used Original Parts
RM 800
Condition: Used (Original)Description
Product Title
Mercedes-Benz W221 Rear Airmatic Air Suspension Strut AS-2821 - Used Original Parts
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
Q: What are the early warning signs that a W221 rear Airmatic strut (like AS-2821) is failing? A: 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.
Why Choose Us?
- Verified functionality
- Actual photos/videos provided
- 30-day exchange warranty
- Pressure-tested for air-tightness to confirm no bellow leaks before shipping
Shipping
Location: Kuala Lumpur, Malaysia Shipping: West Malaysia RM50 (Estimate) / East Malaysia RM80 (Estimate) Delivery: 1-2 working days Packaging: Secure anti-static packaging, heavy-duty shock absorption. (We send actual photos/videos of the unit and packaging before shipping)
Warranty and Return Policy
- 30-day exchange warranty from the date of receipt.
- Proof of professional installation by a qualified workshop is required for warranty claims.
- No returns if the item is opened, modified, tampered with, or damaged due to incorrect electrical wiring.
- Exchange only for confirmed internal electronic defects.
How to Order
- WhatsApp us to confirm compatibility with your specific VIN.
- Send your chassis number or a clear photo of your old unit label.
- Confirm order details and stock availability.
- Receive actual product photos and diagnostic test confirmation.
- Make payment via bank transfer.
- Item is shipped immediately with tracking details provided.
Contact Us
Ready to order or have questions? Tap the WhatsApp button to chat with our team directly.
Price Notice
Price is estimated only. Actual price depends on current stock levels, specific part number revisions, and unit condition. Please WhatsApp us for a formal quote.
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