ExhaustHigh
DPF and AdBlue faults on 2.0 and 3.0 TDI
- Typically appears
- 80,000+ miles
- What to inspect
- Check the AdBlue countdown and run to temperature
2014–2025 Audi A6 · common problems & known faults
The classic executive saloon and Avant. Most arrive as ex-fleet cars with big motorway miles and full history.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed August 2026
Quick answer
The most commonly reported faults on the 2014–2025 Audi A6 are DPF and AdBlue faults on 2.0 and 3.0 TDI, Air suspension on Avant models leaking and dropping and S tronic and multitronic judder and hesitation. 3 of the documented issues are rated high severity · inspect these first. Full inspection points, onset mileage and what to check are listed below.
Reliability snapshot
Based on the documented faults on this page for the Audi A6.
6.1/ 10
- Critical
- 0
- High
- 3
- Medium
- 1
- Low
- 0
Guidance only · reflects reported patterns, not a specific car's condition.
Known faults to check
SuspensionHigh
Air suspension on Avant models leaking and dropping
- Typically appears
- 80,000+ miles
- What to inspect
- Check overnight ride height on air-sprung cars
TransmissionHigh
S tronic and multitronic judder and hesitation
- Typically appears
- 80,000+ miles
- What to inspect
- Test from cold in slow traffic
ElectricalMedium
MMI, matrix headlight and sensor faults
- Typically appears
- Age-related
- What to inspect
- Test the lights, screens and all driver assistance
Inspecting a Audi A6?
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Check this exact carFrequently asked questions
Are ex-fleet A6s good stock?
Yes. Motorway miles with documented servicing are far kinder than low-mileage town use.
What is the hidden cost?
Matrix headlights and air suspension. Both are four-figure jobs at retail prices.
Saloon or Avant?
Avant retails faster in the UK and holds a price premium with family buyers.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.