Series: 2003–2018 (MK1 and MK2) Part Number: 3D0616005Q (Supersedes 3D0616005H/K/L/M/P) Manufacturer: WABCO (OES)

The part number 3D0616005Q is the core air supply unit for the adaptive air suspension system in the Bentley Continental family. It is responsible for inflating the air struts and maintaining the vehicle’s level, regardless of passenger or luggage load.

1. Technical Specifications

• Operating Voltage: 12V

• Max Pressure: Approx. 16–20 Bar

• Components Included: Usually comes as a complete assembly with the thermal sensor, air intake hose, and brass fittings.

• Location: Mounted behind the front bumper/wheel arch area (typically on the driver’s side for LHD vehicles).

2. Common Symptoms of Failure

The 3D0616005Q pump is a “workhorse” but often fails as a secondary result of other system leaks.

• “Suspension Fault” Warning: A yellow or red dashboard notification.

• Noisy Operation: A loud buzzing, grinding, or vibrating sound from the front corner of the car when starting.

• Slow Lift: The car takes more than 30 seconds to move from “Access” height to “Standard” height.

• Frequent Cycling: If you hear the pump turning on every few minutes while driving, you have an air leak.

3. Critical Installation Warning: The Relay

Mandatory: When replacing the compressor, you must replace the Air Suspension Relay (Part No: 4H0951253A or similar).

• Why? When a compressor fails, it often draws excessive current, which can “weld” the relay contacts together. If you install a new pump with an old, stuck relay, the new pump will run continuously until it burns out, often within hours of installation.

4. Maintenance & “Pro-Tips”

• Check for Leaks First: Most pumps fail because an air strut or air line has a small leak. The pump is forced to run 10x more than designed, leading to “burnt” internal seals. Use a soapy water spray on the air bags to find leaks.

• The “Wabco” Alternative: Bentley buys this pump from Wabco. You can often find the identical unit under the Wabco or Arnott (P-2740) brand for significantly less than the “Bentley Boxed” version.

• Air Filter: The system has a small intake air filter. If this becomes clogged or the hose cracks, the pump will ingest road grit and water, destroying the internal piston.