IsItAGoodCar

Common Problems with the
2018 Audi A6 Mk4 (C7)

We've identified 4 known issues that can affect the 2018 Audi A6 Mk4 (C7). 2 of these are serious faults that could be expensive to repair.

4
Known Issues
2
Serious
2
Moderate
0
Minor

The 2018 period has 1 more issue than the Audi A6 Mk4 (C7) average across all year periods.

All Known Issues

3.0 TDI Timing Chain Rattle

SeriousEngine

The V6 TDI timing chains sit at the rear of the engine and the hydraulic tensioners can weaken, causing cold-start rattle and potential chain jump if ignored.

Most affected: 3.0 TDI

Estimated cost: £1,500–£3,000Affects: 2011–2018Often appears around: 80,000–150,000 miles

Typical symptoms

  • •Loud metallic rattle on cold start
  • •Timing fault codes
  • •Rough running

What to inspect before you buy

  • ✓Insist on a stone-cold start
  • ✓Ask for oil change history (avoid long-life 18k intervals)
  • ✓Scan for timing correlation faults

Adaptive Air Suspension Leak

SeriousSuspension & Chassis

Cars with optional adaptive air suspension develop leaks in the air struts, causing the car to sag and the compressor to overwork and fail.

Most affected: Models with adaptive air suspension

Estimated cost: £700–£2,000Affects: 2011–2018Often appears around: 70,000–130,000 miles

Typical symptoms

  • •Car sitting low after parking
  • •Compressor running for too long
  • •Level-control warning

What to inspect before you buy

  • ✓Check ride height before startup
  • ✓Listen for compressor noise
  • ✓Inspect struts for leaks

DPF Clogging and Regeneration Issues

ModerateExhaust & Emissions

Town-driven 3.0 TDI models block their DPFs, causing warning lights, limp mode and expensive DPF cleaning or replacement.

Most affected: 2.0 TDI, 3.0 TDI

Estimated cost: £250–£1,200Affects: 2011–2018Often appears around: 60,000–120,000 miles

Typical symptoms

  • •DPF warning light
  • •Limp mode
  • •Poor throttle response

What to inspect before you buy

  • ✓Ask about driving patterns
  • ✓Scan for DPF soot load
  • ✓Check MOT history for emissions advisories

Electrical Module and Sensor Faults

ModerateElectrics & Electronics

Various electrical issues including MMI glitches, parking sensor failures, steering lock module faults and battery drain from comfort module issues.

Most affected: All models

Estimated cost: £0–£600Affects: 2011–2018Often appears around: 60,000–120,000 miles

Typical symptoms

  • •MMI freezes
  • •Parking sensor failures
  • •Battery drain

What to inspect before you buy

  • ✓Test all electrical systems
  • ✓Scan for fault codes
  • ✓Check for battery drain on overnight stand

Buying Tips for the 2018 Audi A6 Mk4 (C7)

  • ✓Check for coolant leaks in the "V" of 3.0 TDI engines
  • ✓S tronic (DSG) models need fluid changes every 38k miles
  • ✓Listen for humming from the front wheels (wheel bearings)
2011–2017 Audi A6 Mk4 (C7)

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View 2018 Directory

Other Audi A6 Mk4 (C7) Year Periods

2011–20172018

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