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2018–2023 Audi Q8 (4M8)

Browse our directory of 2018–2023 Audi Q8 (4M8) vehicles. Access instant MOT history reports, tax status, and reliability insights for any registration listed below.

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Common Problems & Reliability

3
Serious
1
Moderate
0
Minor

The 2018–2023 Audi Q8 (4M8) has 4 known issues. 3 of these are classified as serious faults that could be expensive to repair. 1 are moderate concerns worth inspecting before purchase.

48V Alternator / Generator Failure

Serious

The 48V mild-hybrid system can fail due to a faulty belt alternator starter, leaving the car stranded when the 12V system drains.

Symptoms: "Electrical System: Fault!" message in red, Start-stop inactive...

Est. repair cost: £1,000–£2,500

Adaptive Air Suspension Leaks

Serious

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

Symptoms: One corner sitting low after parking, Compressor running constantly...

Est. repair cost: £800–£2,500

48V Mild Hybrid System Faults

Serious

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

Symptoms: Electrical system malfunction warning, Start-stop inactive...

Est. repair cost: £0 (recall) – £1,500

Infotainment and MMI Freezing

Moderate

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

Symptoms: Frozen or black screens, Climate controls unresponsive...

Est. repair cost: £0–£900

View detailed Audi Q8 (4M8) fault guide

Buying Tips for the 2018–2023 Audi Q8 (4M8)

  • ✓Check the massive frameless doors for wind noise at motorway speeds
  • ✓Verify the 48V mild-hybrid system is healthy, as alternator failures are a known VW Group wide issue
  • ✓Inspect the large 21- or 22-inch alloy wheels for kerb damage, as replacements and premium tyres are extremely costly

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