A2123202530 A2123204330 Rear Left Air Suspension Shock Absorber Strut for Mercedes-Benz W212 E220  E250  E300 E350

A2123202530 A2123204330 Rear Left Air Suspension Shock Absorber Strut for Mercedes-Benz W212 E220 E250 E300 E350

1. Product Introduction

Original OE Number (Interchangeable Dual PN): A2123202530 (Old version exclusive for AMG / large displacement), A2123204430 (New universal upgraded replacement, replaces 2530 & 2630)

Product Name: Mercedes W212/W218 Rear Air Shock Absorber Assembly, E-Class / CLS-Class Rear Airmatic Air Suspension Strut, Rear Axle AMG / Large Displacement 4MATIC exclusive, with ADS adaptive electronic control air shock absorber assembly

Installation Position: Rear axle, universal for left and right rear. Exclusive for 4MATIC AWD / AMG models, built-in ADS electronic solenoid valve. Not compatible with RWD, non-ADS or conventional mechanical shock absorber vehicles. A2123202530 is original factory PN exclusively for E63/CLS63 AMG and 5.5L/4.7L large-displacement 4MATIC models. Factory upgraded to A2123204430. The two PNs share 100% identical mounting holes, stroke, damping and electronic control logic for direct bolt-on replacement.

Product Description A2123202530 and A2123204430 are high-end AMG / large-displacement 4MATIC exclusive rear ADS air strut assemblies built for Mercedes W212/W218 platform. Fit E63 AMG, CLS63 AMG, E550, CLS550 and other high-power 4MATIC top trims. They are core consumable spare parts for premium air suspension systems. A2123202530 is the early factory AMG-only part, tuned with sport damping to handle heavy curb weight, high power output and high rear axle load of large-displacement vehicles. A2123204430 is the later universal upgraded version, perfectly compatible and replacing old PN 2530, 2630 and others, suitable for all 4MATIC high-spec ADS air suspension models.

This strut comes with built-in ADS adaptive solenoid valve. It dynamically adjusts damping stiffness according to vehicle speed, road condition and body load, balancing sport support for AMG vehicles and comfort during highway cruising. Compared with standard 4MATIC air struts, this unit features larger damping coefficient, higher air spring pressure rating and stronger deformation resistance, specially designed for heavy load, high-speed driving and aggressive driving scenarios of large-displacement AWD vehicles. Common original equipment faults: aging and cracking of air spring after long service time leading to slow air leakage, rear sagging, uneven body posture and insufficient cornering support; internal hydraulic oil degradation and oil seal leakage resulting in bouncy rear cabin, tail sway and floating feeling at high speed; abnormal ADS solenoid valve signal triggering air suspension warning light and disabled adaptive damping function. Delayed replacement will accelerate wear of air compressor, valve block and height sensor and cause cascading failure of the whole air suspension system.

This assembly is 1:1 moulded strictly following Mercedes original AMG / high-spec 4MATIC OE data, adopting factory high-load damping calibration standard. Upgraded thickened multi-layer explosion-proof rubber air spring, multi-stage high-pressure sealing structure, high-strength anti-rust piston rod, long-life anti-fade hydraulic oil and high-sensitivity ADS electronic components. It thoroughly solves common defects of old 2530 version including air leakage, damping fading and unstable electronic signal. This is rear universal AMG / 4MATIC ADS exclusive air strut. Direct bolt-on installation without chassis modification or programming. After installation, air tightness inspection, body height calibration and ADS matching calibration are required to restore original top-tier chassis performance and vehicle posture. Low return rate, ideal for high-end auto repair maintenance, auto parts stocking and cross-border export.

Core Advantages ✅ Dual PN interchangeable: New 4430 perfectly replaces old 2530, also compatible with multiple older 4MATIC PNs, easy stock matching ✅ Tuned exclusively for AMG / large displacement AWD, high damping & strong support, balances sport handling and comfort for heavy top-spec chassis ✅ Built-in factory ADS adaptive electronic control, stable signal without error codes, fully retains intelligent chassis adjustment function ✅ Upgraded explosion-proof air spring and sealing structure, eliminates air leakage, rear sagging, uneven posture and loose chassis issues ✅ Universal for rear left & right, no side distinction required, simple installation and wide compatibility ✅ Bolt-on fit without modification, simple calibration, perfectly restores premium sport chassis texture of Mercedes top trims

2. Custom Attributes (For E-commerce Listing)

3. Compatible Vehicles

Fitment Note: A2123202530 / A2123204430 are AMG / large displacement 4MATIC top-spec exclusive rear ADS electronic air struts for Mercedes W212/W218 platform. Universal for rear left and rear right. Only fits 4MATIC AWD factory ADS adaptive air suspension high-spec / AMG models. Not compatible with RWD, non-ADS, conventional mechanical shocks or other chassis vehicles.

Detailed Compatible Vehicle List

1. Mercedes E-Class W212 (2009‑2016): E550 4MATIC, E400 4MATIC, E63 AMG 4MATIC high-spec versions with ADS air suspension
2. Mercedes CLS-Class W218 (2011‑2017): CLS550 4MATIC, CLS63 AMG factory ADS air suspension high-spec versions
3. Compatible displacement: 4.7L, 5.5L large-displacement AWD and all AMG high-performance versions

4. Interchangeable OE Numbers

Main OE Pair: A2123202530 (Old AMG PN), A2123204430 (New universal replacement) Interchangeable Older OE Part Numbers: A2123201630, A2123202630, A2123203730, A2123203830

Interchange Instruction: All above part numbers are OEM interchangeable rear ADS air struts for W212/W218 4MATIC. High-load damping parameters, ADS electronic logic, air spring pressure and mounting holes are 100% identical. PN4430 is the latest final version, directly replacing all old PNs without modification or coding.

5. FAQ

Q1: What is the difference between PN 2530 and 4430? Can they replace each other? A: A2123202530 is the early AMG large displacement exclusive old PN and already discontinued. A2123204430 is factory upgraded universal version with optimized sealing and durability. They share identical dimension, function and electronic control. 100% bolt-on interchangeable, it is the best upgrade replacement for old PN2530.

Q2: Can it fit RWD vehicles or low-spec 4MATIC without ADS? A: No. This strut is ADS electronic controlled high-load AMG / top-spec 4MATIC exclusive. RWD vehicles have no electronic wiring harness and mismatched chassis load parameters; low-spec non-ADS 4MATIC has no corresponding signal harness. Improper installation triggers error codes, function failure and mismatched support force.

Q3: Do I need to tell left and right for this rear strut? A: No side distinction required. This part is universal for rear left and rear right. Easy stocking and installation for same-position vehicles.

Q4: Is computer programming required after replacement? A: No programming or coding required. After installation, perform air tightness inspection, rear height calibration and ADS adaptive matching calibration, clear fault codes then ready for use.

Q5: Can AMG vehicles restore original sport chassis feel after replacement? A: Yes. This product adopts original AMG high-damping and high-support calibration parameters, perfectly matches body load of large-displacement vehicles. After installation, it thoroughly fixes loose rear end, large body roll in cornering and high-speed floating, restoring top-spec sport chassis performance.

Q6: Only one strut is damaged, can I just replace the single one? A: Not recommended. AMG / 4MATIC chassis requires high consistency of chassis performance. New and old struts differ in damping and pressure retention. Single-side replacement leads to uneven rear load, posture deviation and shaking. We recommend replacing left and right rear struts in pairs.

Q7: What symptoms mean I need to replace this air strut? A: Rear sinks overnight, front-high-rear-low posture, uneven rear height, bouncy and loose rear over bumps, floating at high speed, insufficient cornering support, frequent air compressor activation, ADS / air suspension warning light, chassis vibration and abnormal noise.

Q8: Does it fit W212 estate and CLS brake AMG models? A: Fully compatible. As long as it is W212/W218 chassis, 4MATIC with ADS, AMG / large displacement high spec, sedan, estate and  brake versions are all universal.

6. Custom Service

1. OEM Private Label Service: Custom logo printing, neutral no-logo export package, customized color box for cross-border platforms such as Amazon, eBay, AliExpress.
2. Bulk Supply: 2530/4430 AMG 4MATIC ADS air strut in stable stock, support retail, sold in pairs, large wholesale and full container export orders, stable supply, fast lead time and competitive price.
3. Complete Top-spec Air Suspension Package: One-stop supply of full air suspension spare parts for W212/W218 AMG / 4MATIC, front & rear ADS air struts, air springs, air compressors, dryers, valve blocks, height sensors and repair kits, available as complete sets.
4. E-commerce Material Support: Free product photos, close-up detail pictures, OE cross reference table, AMG / 4MATIC fitment sheet and installation calibration reference documents, ready for store listing, video marketing and product page design.