Belt Starter Generator (BSG) Failure
SeriousElectrics & ElectronicsThe 48V mild-hybrid system can fail, leading to an "Electrical system: fault" message.
Est. Repair Cost: £0–£1,500
Reliability GuideCommon Problems with the
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
3
Known Issues
1
Serious
2
Moderate
0
Minor
All Known Issues
Dual MMI Touch Response Screen Freezing & Blackouts
ModerateElectrics & ElectronicsThe 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
2.0 TDI / 3.0 TDI Coolant Regulation Valve & Water Pump Weepage
ModerateCooling SystemElectrically 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
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