IsItAGoodCar
Reliability Guide

Common Problems with the
2019 Audi A6 Mk5 (C8)

The launch year brought Audi's most tech-heavy executive car with dual-touchscreen MMI and 48V mild-hybrid as standard. Early cars carry a known BSG failure risk that led to UK recalls — verify the recall has been completed before purchase.

What changed for 2019

  • •Launch with 2.0 TFSI, 3.0 TDI, and 55 TFSI engines
  • •Standard 48V mild-hybrid system
  • •Dual-touchscreen MMI interface
  • •Mild-hybrid as standard across the range

Common MOT watch-outs

  • !48V BSG failure at 20k–60k miles
  • !AdBlue and NOx-sensor faults on diesels
  • !Dual MMI screen freezes and reboots
5
Known Issues
3
Serious
2
Moderate
0
Minor

All Known Issues

Belt Starter Generator (BSG) Failure

SeriousElectrics & Electronics

The 48V mild-hybrid system can fail, leading to an "Electrical system: fault" message.

Est. Repair Cost: £0–£1,500
Warning Signs:

Warning messages, Total electrical failure while driving

What to Inspect:
  • Check Audi recall database for "48V BSG" campaign
  • Ask for evidence the starter-alternator recall (R/2020/138 / R/2020/265) has been completed
Verified by IsItAGoodCar Research TeamUpdated
Official Recalls & Reference Documents:

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

Dual MMI Touch Response Screen Freezing & Blackouts

ModerateElectrics & Electronics

The dual upper (navigation/media) and lower (climate/haptics) touchscreen displays can fail to initialize, suffer touch input lag, or reboot randomly while driving.

Est. Repair Cost: £0–£650
Warning Signs:

Lower climate screen unresponsive to haptic touch, Upper display freezes on Audi logo, Reversing camera image flickers

What to Inspect:
  • Test both touchscreens through multiple submenus
  • Verify MIB3 software version is above 3241
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 2019 Audi A6 Mk5 (C8)

  • Check GOV.UK recall database for R/2020/138 and R/2020/265 BSG campaigns
  • Test both touchscreens for responsiveness
  • Verify AdBlue and NOx-sensor health on diesel models
20182020–2021
Check a 2019 Audi A6 Mk5 (C8) by Registration