Quick Facts — Audi A8

Est. On UK Roads
25,000+
Years Made
1994–present
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.

1
Air Suspension Failure
High Priority
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
2
3.0 TDI / 4.2 TDI DPF and EGR
High Priority
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
3
Timing Chain (3.0 TFSI)
Watch
The 3.0 TFSI petrol A8 can develop timing chain tensioner wear on higher-mileage examples.
💷 Typical repair cost: £1,500–£4,000
4
MMI and Electrical Complexity
Watch
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
5
PHEV Battery Degradation (D5)
Watch
The A8 60 TFSI e PHEV is showing battery degradation and charging system faults on older examples.
💷 Typical repair cost: £500–£5,000+
6
Air Con System (Rear)
Low Priority
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 Find Your Problem Now → 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.

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Frequently Asked Questions

What is the most common problem with the Audi A8?

The most frequently reported issue on the Audi A8 is Air Suspension Failure. 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.

How many Audi A8s are on UK roads?

There are an estimated 25,000+ Audi A8s currently on UK roads.

What tyres does the Audi A8 use?

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.

Will a warning light fail my Audi A8's MOT?

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.

Similar Issues on Other Models

Audi A6 — another air suspension failure case worth knowing about Audi A7 — another air suspension failure case worth knowing about

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 Find Your Problem Now → gives you likely fault causes, UK repair cost estimates and MOT risk — instantly.

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Other Audi Models

Audi A1 → Audi A3 → Audi A4 → Audi A5 →