IsItAGoodCar
Reliability Guide

Common Problems with the
2005 Bentley Continental GT (Mk1)

We've identified 3 known issues that can affect the 2005 Bentley Continental GT (Mk1). 2 of these are serious faults that could be expensive to repair.

3
Known Issues
2
Serious
1
Moderate
0
Minor

All Known Issues

W12 Vacuum Pipe Failure

SeriousEngine

Plastic vacuum pipes located behind the engine and over the gearbox become brittle from heat and crack, causing boost leaks and rough idling.

Est. Repair Cost: £1,500–£7,000
Warning Signs:

Check Engine Light (CEL), Rough idle, Loss of power, Brake pedal feels hard

What to Inspect:
  • Check for error codes related to lean running or boost pressure
  • Ask if pipes have been replaced with silicone or metal versions
Verified by IsItAGoodCar Research Team

Air Strut Leakage

SeriousSuspension & Chassis

The rubber air bags in the suspension struts perish and leak, often leading to a burnt-out compressor.

Est. Repair Cost: £800–£1,200 per corner
Warning Signs:

Car sags on one corner after parking, Compressor runs continuously, "Stop Car Too Low" warning

What to Inspect:
  • Measure ride height at each corner after the car has sat
  • Spray soapy water on struts to check for bubbles during a PPI
Verified by IsItAGoodCar Research Team

Electrical Drain / Battery Failure

ModerateElectrics & Electronics

The dual-battery system (one for starting, one for systems) can be drained by modules that fail to "sleep," leading to numerous false error messages.

Est. Repair Cost: £300–£600
Warning Signs:

Intermittent electrical gremlins, Slow cranking, TPMS or Airbag warnings that clear after driving

What to Inspect:
  • Check the age of both batteries in the boot
  • Ensure the car comes with its battery conditioner and it works
Verified by IsItAGoodCar Research Team

Buying Tips for 2005 Bentley Continental GT (Mk1)

  • Insist on seeing proof of vacuum pipe replacement or the bypass modification.
  • Check for the "Stop Car Too Low" warning after the car has stood overnight.
  • Listen for a noisy air suspension compressor behind the front bumper.
  • Ensure the boot lid spoiler operates correctly at speed or via the manual switch.
Check a 2005 Bentley Continental GT (Mk1) by Registration