UK Reliability Directory

Audi Q8 (4M8)

Production Years: 2018 - 20254 Documented Faults

The Audi Q8 is the stylish, coupe-SUV sibling to the Q7, offering a wider, more aggressive stance and a slightly sportier driving experience. Positioned at the very top of Audi's SUV range, it competes with the BMW X6 and Porsche Cayenne Coupe, bringing massive road presence, huge running costs, and premium insurance premiums. It is vast and complex, sharing the same 48V mild-hybrid architecture and dual-screen infotainment as the A6 and A7, making warranty coverage highly recommended for used buyers. It suits affluent buyers who want the practicality of a large SUV but prioritize striking, aggressive design over absolute cargo volume.

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Common Faults & Reliability

These are the most common documented problems for the Audi Q8 (4M8), sorted by their typical impact and frequency.

48V Alternator / Generator Failure

high severity

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

Est. repair cost:£1,000–£2,500

Adaptive Air Suspension Leaks

high severity

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

Est. repair cost:£800–£2,500

Infotainment and MMI Freezing

medium severity

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

Est. repair cost:£0–£900
View All 4 Documented Issues

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