IsItAGoodCar
Reliability Guide

Common Problems with the
2003 Audi A8 Mk2 (D3)

The launch year of the D3 brought Audi's all-aluminium flagship with full air suspension as standard. Early cars are now over 20 years old and every air suspension strut and compressor will likely need attention — this is the single biggest ownership cost.

What changed for 2003

  • •Launch of the D3 generation; engine availability expanded during production
  • •Full aluminium spaceframe construction
  • •Standard adaptive air suspension on all models

Common MOT watch-outs

  • !Air suspension strut and compressor failure
  • !Electrical module and CAN-bus faults
  • !Coolant system leaks from valley area
3
Known Issues
2
Serious
1
Moderate
0
Minor

All Known Issues

Air Suspension Strut and Compressor Failure

SeriousSuspension & Chassis

The full air suspension on all four corners inevitably develops leaks as the rubber air bellows age, eventually killing the WABCO compressor.

Est. Repair Cost: £800–£3,500
Warning Signs:

One corner sagging overnight, Compressor running constantly, Suspension warning light, Harsh stiff ride

What to Inspect:
  • Park on level ground and check ride height after 12+ hours
  • Listen for compressor running excessively
  • Check for oil residue around struts
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Multitronic CVT Gearbox Issues

SeriousGearbox & Transmission

The Multitronic CVT gearbox can judder, flare, or lose drive if fluid changes were skipped or the gearbox ECU starts to fail.

Est. Repair Cost: £1,000–£2,500
Warning Signs:

Rev flare under acceleration, Judder pulling away, Flashing PRNDS or gearbox warning

What to Inspect:
  • Drive from cold and warm in traffic
  • Ask for fluid service invoices
  • Confirm the fitted gearbox and obtain a specialist inspection if engagement is poor
Verified by IsItAGoodCar Research TeamUpdated

Electrical Module Failures

ModerateElectrics & Electronics

Ageing electronics cause multiple module failures, including keyless entry antennas, comfort modules, and CAN bus communication faults.

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

Multiple dashboard warnings, Keyless entry not working, Intermittent window or seat faults, Battery drain

What to Inspect:
  • Run a full diagnostic scan with VCDS
  • Test all comfort functions
  • Check for parasitic battery drain
Verified by IsItAGoodCar Research Team

Buying Tips for 2003 Audi A8 Mk2 (D3)

  • Air suspension is non-negotiable on the D3 — budget £800–£3,500 for strut replacement
  • Have a full diagnostic scan done with VCDS before buying
  • W12 and 4.2 TDI models demand flawless service history
20022004–2006
Check a 2003 Audi A8 Mk2 (D3) by Registration