Aston Martin DBS Rear Shock Absorber KY7318W002CA

part number KY73-18W002-CA refers to the Genuine OEM Rear Spring and Damper Assembly for the Aston Martin DBS Superleggera.

Because the DBS is the performance flagship of the VH3 platform, its suspension is significantly more advanced than the standard DB11. This unit is part of the Adaptive Damping System (ADS), which utilizes Bilstein’s electronic valving technology.

1. Technical Breakdown

• Application: Aston Martin DBS Superleggera (Coupe & Volante) 2018–2024.

   

• System: Adaptive Damping with “Skyhook” technology.

   

• Component Type: Coilover-style assembly (includes the shock absorber body, coil spring, and electronic actuator).

• Dynamics: This damper is specifically tuned for the DBS’s wider rear track (+20mm vs. DB11) and its massive torque output. It provides three distinct stiffness profiles: GT, Sport, and Sport+.

   

2. Why the “KY73” Prefix Matters

While the DB11 uses a similar-looking part (HY53-18W002), you cannot swap them.

• The KY73 version (DBS) has a different internal shim stack and spring rate to handle the increased downforce produced by the DBS’s double-diffuser and rear spoiler.

• Installing a DB11 damper on a DBS will result in excessive “squat” under acceleration and may trigger a suspension fault code due to the different electronic resistance in the valve actuator.

3. Common Failure Points

1. Hydraulic Leaking: If you see “misting” or wet oil on the lower body of the damper, the internal seals have failed. A leaking damper will eventually lose its gas pressure, leading to a “bouncy” rear end.

2. Actuator Faults: The electronic plug at the top of the shock can sometimes suffer from terminal corrosion or wiring fatigue. This usually triggers a yellow “Suspension Fault” warning on the dashboard and locks the car into its firmest setting.

3. Upper Bushing Wear: The rubber mounting at the top of the strut can perish over time, leading to a dull “thumping” or “knocking” sound when driving over small bumps at low speeds.

Cost & Sourcing (2026 Estimates)

The DBS suspension is considerably more expensive than the standard DB9 or Vantage systems.

Installation Tip: Calibration

When replacing the KY73-18W002-CA, it is standard practice to perform a Ride Height Calibration using the AMDS (Aston Martin Diagnostic System). This tells the Chassis Control Module the exact “zero point” of the new damper, ensuring the 360-degree cameras and adaptive headlights remain correctly leveled.