A2123202630 A2123204430 Rear Right Air Suspension Shock Absorber Strut With ADS for Mercedes-Benz W212 E220  E250  E300 E350

A2123202630 A2123204430 Rear Right Air Suspension Shock Absorber Strut With ADS for Mercedes-Benz W212 E220 E250 E300 E350

1. Product Introduction

Original OE Number (Interchangeable Dual PN): A2123202630 (old version), A2123204430 (new upgraded replacement)

Product Name: Mercedes W212/W218 Rear Air Shock Absorber Assembly, E-Class / CLS-Class Rear Airmatic Air Suspension Strut, Rear Axle 4MATIC exclusive ADS adaptive electronically controlled air shock absorber assembly

Installation Position: Rear axle, universal for left and right rear. Exclusively for 4MATIC AWD vehicles, built-in ADS electronic solenoid valve. Not compatible with RWD, non-ADS or conventional mechanical shock absorber vehicles. These two part numbers are factory upgraded interchangeable parts. The old PN A2123202630 is fully replaced by new PN A2123204430. Structure, damping, electronic control logic, mounting hole and stroke are 100% identical. Fits Mercedes W212/W218 high-spec AWD models equipped with ADS air suspension.

Product Description A2123202630 and A2123204430 are factory original rear universal ADS electronic air strut assemblies for Mercedes W212/W218 4MATIC AWD platform. They are core wearable spare parts for E-Class & CLS-Class high-spec AWD air suspension vehicles. The factory has carried out model iteration upgrade; old PN A2123202630 is discontinued, and new PN A2123204430 is the perfect drop-in replacement. The two PNs can be directly swapped without modification. Built with ADS adaptive damping solenoid valve, tuned for heavy-load AWD chassis. It dynamically adjusts shock stiffness according to speed, road condition and AWD load, balancing high-speed AWD stability, bump support and premium riding comfort, perfectly matching factory chassis calibration parameters of W212/W218 4MATIC high-spec models.

Mercedes W212/W218 AWD vehicles have heavier curb weight and higher rear axle drive load. Long highway driving, rough bumpy roads, temperature cycling, chassis mud corrosion and repeated air charging/discharging of air suspension system will easily cause aging and failure of rear air struts. Common factory defects: hardening, cracking, bulging and slow air leakage of air rubber spring, resulting in rear sagging, uneven vehicle posture and degraded AWD stability; internal hydraulic oil degradation and high-pressure oil seal leakage lead to weak damping, bouncy rear cabin and severe tail sway; carbon deposit and signal drift on ADS solenoid valve trigger air suspension warning light, ADS electronic alarm and limited adaptive damping function. Typical vehicle symptoms: rear sinks overnight, uneven rear height, body sway during AWD cornering, floating tail at high speed, frequent air compressor activation, slow chassis height adjustment and impact noise over potholes. Delayed replacement will damage air compressor, valve block and height sensor, triggering cascading failure of whole air suspension system and high repair cost.

This dual-PN universal AWD rear ADS air strut is 1:1 moulded strictly following Mercedes original 4MATIC OE specification. AWD-specific damping coefficient, air spring pressure rating, ADS electronic logic, mounting holes and stroke fully meet the latest 4430 iteration standard. Adopts thickened multi-layer high-low temperature resistant explosion-proof air spring, multi-stage high-pressure sealing structure, anti-rust precision piston rod, long-life anti-fade hydraulic oil and high-sensitivity AWD-compatible ADS solenoid valve. It greatly improves anti-aging, anti-cracking, fatigue resistance and burst pressure performance, solving common defects of old 2630 such as air leakage, damping fading and unstable electronic signal. This is high-spec AWD ADS air strut version. Direct bolt-on installation without chassis modification. After installation, air tightness inspection, rear height calibration and ADS 4MATIC matching calibration are required to restore all original intelligent air suspension functions and firm premium chassis texture for AWD vehicles. Low return rate, ideal for auto repair shop maintenance, auto parts stocking and cross-border foreign trade.

Core Advantages ✅ Dual PN fully interchangeable: old 2630 / new 4430 factory direct replacement, solve PN matching confusion, 100% bolt-on fit ✅ Exclusive for AWD rear axle, built-in ADS solenoid valve, fits W212/W218 high-spec AWD air suspension, retains full adaptive damping function ✅ Tuned for heavy 4MATIC rear load, fixes rear sagging, high-speed floating and corner sway issues ✅ Upgraded thick explosion-proof air spring, temperature resistant & anti-aging, eliminates slow air leakage, overnight rear drop and uneven posture ✅ High-sensitivity ADS electronic response, stable signal without error codes, perfectly matches original AWD ECU logic, no function limitation ✅ Sold as complete brand-new assembly with full accessories, simple calibration, greatly reduced after-sales cost, suitable for domestic & export sales

2. Custom Attributes (For E-commerce Listing)

3. Compatible Vehicles

Fitment Note: A2123202630 / A2123204430 are AWD-exclusive rear universal ADS electronic air struts for Mercedes W212/W218 platform. Two PNs are factory interchangeable, universal for rear left and rear right. Only fits 4MATIC AWD factory ADS adaptive air suspension 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): E250 4MATIC, E300 4MATIC, E350 4MATIC, E400 4MATIC, E500 4MATIC, E550 4MATIC high-spec versions with ADS air suspension
2. Mercedes CLS-Class W218 (2011‑2017): CLS350 4MATIC, CLS550 4MATIC factory ADS air suspension versions
3. Mercedes W212 AMG series: E63 AMG 4MATIC AWD models with ADS air suspension

4. Interchangeable OE Numbers

Main OE Pair: A2123202630, A2123204430 Interchangeable Older OE Part Numbers: A2123201630, A2123203730, A2123203830

Interchange Instruction: All above part numbers are OEM interchangeable rear ADS air struts for W212/W218 4MATIC. AWD damping parameters, ADS electronic logic, air spring pressure and mounting holes are 100% identical. Direct bolt-on swap without chassis modification or coding.

5. FAQ

Q1: What is the relation between PN 2630 and 4430? Can they be interchanged? A: They are factory version iteration upgrade. A2123202630 is the old discontinued PN; A2123204430 is new upgraded replacement. Structure, dimension, electronic control and function are fully identical, universal for rear axle, can be freely swapped.

Q2: Can it be installed on RWD 2MATIC vehicles? A: No. This air strut is heavy-load AWD 4MATIC exclusive with ADS. RWD chassis has different load, damping stroke and no corresponding wiring harness. Improper installation triggers error codes, abnormal height and mismatched support, cannot work normally.

Q3: Do I need to distinguish left and right for this rear strut? A: No side distinction required. This part is universal for rear left and rear right. Both sides can be fitted directly, easier for stocking and installation.

Q4: Do I need coding or programming after replacement? A: No programming or coding required. Air tightness inspection, rear height calibration and ADS 4MATIC matching calibration must be performed, clear fault codes to restore all intelligent air suspension functions.

Q5: What symptoms indicate that I need to replace this rear ADS air strut? A: Rear sinks overnight, front-high-rear-low posture, uneven rear height, tail sway during AWD cornering, floating body at high speed, frequent air compressor activation, slow height adjustment, ADS / air suspension warning light, bouncy ride over bumps and rear chassis noise. These indicate air leakage, damping fading or electronic failure of the strut.

Q6: Only one rear strut failed, do I need to replace both rear struts as pair? A: Strongly recommend replacing rear left and right in pairs. AWD chassis requires high consistency of damping, support force and electronic response on both sides. Single-side replacement causes uneven rear load, shaking, reduced AWD stability and abnormal tire wear.

Q7: Can non-ADS low-spec AWD vehicles use this part? A: No. This assembly is built-in ADS solenoid valve. Low-spec AWD without ADS has no matching wiring harness and control program. It will continuously report error codes after installation, adaptive damping function fails completely.

Q8: Are interchange OE numbers support bolt-on installation? A: All support direct bolt-on swap. All iterated OEs share identical parameters, dimensions and electronic logic, fit same rear AWD position without modification.

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: 2630/4430 dual-PN universal AWD rear ADS air strut in stable stock, support retail, large wholesale and full container export orders, stable supply, fast lead time and competitive price.
3. Complete W212/W218 AWD Air Suspension Package: One-stop supply of full air suspension spare parts for E/CLS AWD, 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, W212/W218 AWD fitment sheet and installation calibration reference documents, ready for store listing, video marketing and product page design.