IsItAGoodCar
Reliability Guide

Common Problems with the
2024 Audi Q8 (4M8)

We've identified 4 known issues that can affect the 2024 Audi Q8 (4M8). 3 of these are serious faults that could be expensive to repair.

4
Known Issues
3
Serious
1
Moderate
0
Minor

All Known Issues

48V Mild Hybrid System Faults

SeriousElectrics & Electronics

The belt-starter-generator can fail, disabling start-stop and energy recuperation, and potentially stranding the car when both batteries drain.

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

Electrical system malfunction warning, Start-stop inactive, Rough engine restarts

What to Inspect:
  • Check for completed recall or service campaign work
  • Scan for 48V system fault codes
  • Verify battery health
Verified by IsItAGoodCar Research Team

Adaptive Air Suspension Leaks

SeriousSuspension & Chassis

The air springs can develop leaks causing uneven ride height, and the compressor burns out trying to compensate.

Est. Repair Cost: £800–£2,500
Warning Signs:

One corner sitting low after parking, Compressor running constantly, Air suspension warning light, Bouncy ride

What to Inspect:
  • Inspect ride height after standing overnight
  • Cycle suspension through height settings
  • Listen for compressor strain or hissing from wheels
Verified by IsItAGoodCar Research Team

TDI SCR / AdBlue System Faults

SeriousExhaust & Emissions

Diesel versions with SCR can develop dosing, heater or NOx sensor faults. A system fault may lead to a no-restart countdown even with sufficient AdBlue; diagnosis should distinguish fluid level from component failure.

Warning Signs:

AdBlue system warning, No-restart countdown

What to Inspect:
  • Check warning history and emissions repair invoices
  • Request a diagnostic check of dosing pressure, heater operation and NOx readings
Verified by IsItAGoodCar Research TeamUpdated

Infotainment and MMI Freezing

ModerateElectrics & Electronics

The dual-touchscreen MMI system can freeze, go black, or reboot spontaneously, affecting climate and vehicle controls.

Est. Repair Cost: £0–£900
Warning Signs:

Frozen or black screens, Climate controls unresponsive, Navigation or media dropouts

What to Inspect:
  • Test both touchscreens extensively
  • Check software version and update history
  • Verify no persistent error messages
Verified by IsItAGoodCar Research Team

Buying Tips for 2024 Audi Q8 (4M8)

  • Look out for 48V electrical system faults, specifically the Belt Starter Generator (BSG) failure, which will drain the battery and leave the car stranded; verify if it has been replaced under warranty.
  • Test the dual-touchscreen MMI system thoroughly for responsiveness and ensure the haptic feedback works evenly across both screens.
  • Check the frameless doors for excessive wind noise at motorway speeds, which may indicate worn weather seals or poorly aligned window regulators.
  • Inspect the enormous alloy wheels (up to 23 inches) for kerbing and check tyre tread depth; replacing a set of premium tyres is exceptionally expensive.
  • Ensure the adaptive air suspension adjusts smoothly between modes without sagging or throwing dash warnings, as replacing the complex struts is a huge expense.
  • Verify that the automatic gearbox downshifts cleanly when slowing to a stop; some owners report clunky or hesitant downshifts that require transmission software recalibration.
20232025
Check a 2024 Audi Q8 (4M8) by Registration