Arnott MR-3851 Suspension Shock Absorber - Rear

Arnott MR-3851 Rear Magnetic Shock

Arnott MR-3851 is a rear magnetic shock absorber for the 2015-2020 Audi A3 and 2017-2020 Audi RS3 with electronic suspension. It is built for the Audi A3/S3 (8V) platform, including hybrid applications, and connects to the vehicle ECU without modification.

The Magnetic Shock line focuses on OE-style electronic damping performance. This Arnott rear shock uses a monotube damper filled with magnetorheological fluid, allowing the suspension response to change through electromagnetic control for adaptive ride behavior.

Key Features

• Rear suspension shock absorber for Audi A3, S3, and RS3 applications with electronic suspension
• Fits left or right rear position on the vehicle
• Monotube design with magnetorheological fluid for electronically controlled damping
• Direct ECU connection with no vehicle modifications required
• OES-style replacement for the Audi A3/S3 (8V) platform, including hybrids
• Part number MR-3851 for catalog and cross-reference lookup

Detailed Description

Arnott MR-3851 is a rear magnetic shock absorber engineered for the Audi A3/S3 (8V) platform and related RS3 applications with electronic suspension. The damper uses magnetorheological fluid, which contains magnetized iron particles suspended in synthetic oil. When the electromagnetic coils are activated, the fluid response changes to alter damping stiffness and ride control. This makes the MR-3851 a direct-fit electronic rear shock for drivers replacing a worn OE magnetic unit on an Audi A3 or Audi S3.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

What It Helps Address

• Rear shock leakage or loss of damping control
• Electronic suspension warning messages related to the rear damper
• Uneven or inconsistent rear ride response
• Excessive bounce, harshness, or reduced stability over road inputs
• Replacement needs for an OE magnetic rear shock on Audi A3, S3, or RS3 models

Installation Notes and Tips

• Fits 2015-2020 Audi S3, rear, w/Electronic Suspension; Magnetic Shock
• Fits 2017-2020 Audi RS3, rear, w/Electronic Suspension; Magnetic Shock
• Fits the left or right rear side
• Verify electronic suspension diagnosis before replacement
• Confirm connector condition and routing during installation to preserve ECU communication

Quality Assurance

Arnott’s Magnetic Shock line is built as an OE-style electronic suspension replacement for vehicles that use magnetic damping. MR-3851 is designed to restore factory-type rear shock control on the Audi A3/S3 platform while maintaining ECU integration.