The Audi A8 is Audi's flagship luxury saloon — technologically advanced, exceptionally refined and expensive to maintain. The D4 (2010–2017) and D5 (2017–present) are both on UK roads. Used examples offer extraordinary value but running costs can be significant.
Quick Facts — Audi A8
Common Engines
3.0 TFSI, 4.0 TFSI, S8, 3.0 TDI, 4.2 TDI, 60 TFSI e PHEV
6 Most Common Audi A8 Problems
These are the faults most frequently seen on the Audi A8 by UK garages — ranked by how commonly they occur and what they cost to fix.
The A8's air suspension is complex and failure is common on older examples. Compressor, air line and air bag failures are all seen. Sitting low or unevenly is the giveaway.
💷 Typical repair cost: £600–£3,000
High-mileage diesel A8s develop DPF and EGR issues. The large and heavy A8 needs regular motorway runs to maintain DPF health.
💷 Typical repair cost: £300–£2,000
The 3.0 TFSI petrol A8 can develop timing chain tensioner wear on higher-mileage examples.
💷 Typical repair cost: £1,500–£4,000
The A8's extremely complex electrical architecture means module failures, MMI system errors and CAN bus faults are common on older examples.
💷 Typical repair cost: £200–£2,000
The A8 60 TFSI e PHEV is showing battery degradation and charging system faults on older examples.
💷 Typical repair cost: £500–£5,000+
The A8's rear air conditioning system can develop faults independent of the front — common on high-mileage chauffeur examples.
💷 Typical repair cost: £200–£800
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Audi A8 — MOT Tips
Air suspension must function and sit level — uneven height is an MOT fail. All dashboard warning lights must be clear. DPF and AdBlue warnings are automatic fails on diesel models.
Engine management light on before your MOT? It's an automatic fail. Run a
MotorLoom diagnostic for £1.99 to get the likely cause and repair cost before booking the test.
Audi A8 Tyres
Most Audi A8 models run 245/50 R18 or 255/45 R19 or 265/40 R20 depending on trim level and year. Always check the placard inside the driver's door for the exact size for your vehicle.
Summary
The A8 is outstanding luxury at a fraction of new price. But air suspension costs, electrical complexity and premium parts pricing mean it suits buyers prepared for the occasional large bill. Full service history is absolutely essential.
If your Audi A8 has a warning light on or a symptom you can't identify, a MotorLoom diagnostic report for £1.99 gives you likely fault causes, UK repair cost estimates and MOT risk — instantly.
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