IsItAGoodCar
Reliability Guide

Common Problems with the
2024 Audi A6 Mk5 (C8)

We've identified 3 known issues that can affect the 2024 Audi A6 Mk5 (C8). 2 of these are serious faults that could be expensive to repair.

3
Known Issues
2
Serious
1
Moderate
0
Minor

All Known Issues

DL382 S tronic Gear Selection / Mechatronic Faults

SeriousGearbox & Transmission

Control or clutch faults can interrupt gear selection. Identify the gearbox code first: this entry applies to the longitudinal DL382 family, not every automatic sold under the same model name.

Warning Signs:

Gearbox warning, Delayed engagement or missing gears

What to Inspect:
  • Test drive from cold and again when warm
  • Check gearbox-specific service invoices and obtain a diagnostic report
Verified by IsItAGoodCar Research TeamUpdated

TDI AdBlue / NOx Sensor Faults

SeriousExhaust & Emissions

SCR dosing or NOx sensor faults can trigger an emissions warning and a no-restart countdown. Adding fluid alone does not resolve every system fault.

Warning Signs:

AdBlue system fault, No-restart countdown

What to Inspect:
  • Check stored faults and repair invoices
  • Have dosing pressure and NOx readings checked before replacing parts
Verified by IsItAGoodCar Research TeamUpdated

2.0 TDI / 3.0 TDI Coolant Regulation Valve & Water Pump Weepage

ModerateCooling System

Electrically controlled coolant regulator shut-off valves and vacuum-actuated water pump plastic housings develop weeping leaks, coating the front of the block in crusty pink residue.

Est. Repair Cost: £380–£850
Warning Signs:

Low coolant warning chime, Coolant level steadily drops over 1,000 miles, Faint sweet smell from engine bay

What to Inspect:
  • Inspect lower undertray and engine front for pink coolant crust
  • Verify expansion tank pressure seal
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2024 Audi A6 Mk5 (C8)

  • Ensure the Belt Starter Generator (BSG) recall has been performed
  • Check both touchscreens for responsiveness
  • Verify AdBlue and NOx sensor health
2023
Check a 2024 Audi A6 Mk5 (C8) by Registration