Audi A8 60 TFSI e D5

The D5 A8 uses adaptive air suspension on all four corners as standard. The rubber bellows on each strut can develop micro-cracks from age, UV exposure, and road salt, allowing air to leak. Symptoms include the car sitting lower on one corner after standing, or the compressor running frequently. OEM strut replacement costs approximately €1,000-1,400 per corner including labor. Aftermarket alternatives from suppliers like Aerosus are available for around €700-800 per strut. If the compressor overworks due to a leaking strut, it can fail too, adding another €600-1,000. The issue typically appears after 80,000-120,000 km or 6-8 years, with front struts usually failing first.

All D5 A8 models use a 48V mild hybrid system alongside the main powertrain. The belt starter generator (BSG) is a known weak point across Audi's 48V lineup, with European recalls dating back to 2020. When the BSG fails, it can drain the 48V battery, which in turn affects the 12V system through the voltage converter. Symptoms include sudden loss of start-stop functionality, charging warnings, or complete failure to start. Replacement costs €1,500-3,000 depending on the shop. Several owners report this happening between 40,000 and 80,000 km. The unit sits in the engine bay and requires significant labor to access.

The 60 TFSI e carries a 14.4 kWh (17.9 kWh gross) lithium-ion battery pack in the rear. Over time, battery capacity degrades naturally, reducing the electric-only range from roughly 40-50 km to 25-30 km. More concerning are cell-level faults that can trigger warning lights and disable EV mode entirely. Audi covers the HV battery for 8 years / 160,000 km with a 70% capacity guarantee in the EU, so many used examples may still have partial warranty coverage. Out-of-warranty replacement costs can be substantial, with US estimates around €10,000-12,000 for the full pack. Cell-level repairs at specialists may run €3,000-5,000. A KBA recall (15663R) also affects certain 2019-2024 Q7, A8, and Q8 models for battery overheating risk. Verify this recall has been completed.

The D5 A8 uses a dual-touchscreen MMI system that controls nearly all vehicle functions including climate, seat adjustment, and navigation. Owners report occasional screen blackouts, freezing, and reboot loops. A soft reset (holding the volume knob for 10 seconds) resolves roughly 30% of instances. Persistent issues may require a software update (typically free at dealers) or replacement of the MMI main unit (part numbers starting with 4K0). Main unit replacement is expensive due to Audi's component protection system, which requires dealer-level online programming. Software-related recalls have addressed some of these issues on 2021 models. Hardware failure of the upper display unit can cost €2,000-3,500 for parts and programming.

A detailed investigation by 034Motorsport documented piston failures in the EA839 3.0T engine across multiple Audi and Porsche models. The factory piston design has two critical issues: piston instability (rocking) causing skirt wear, and machined oil control ring drain holes acting as stress risers. One Audi dealership reported 14 cases in stock engines within a 6-week period. However, Audi has produced hundreds of thousands of these engines and the overall failure rate remains well below 5%. Audi has released three piston revisions over the production run, suggesting internal awareness. In the 60 TFSI e application, the engine operates at moderate loads much of the time due to electric motor assistance, which may reduce stress. If catastrophic piston failure does occur, engine rebuild or replacement costs €5,000-15,000.

The 60 TFSI e uses an onboard charger to convert AC power for battery charging. Issues include charging port locking errors, onboard charger module failure, and problems with the supplied charging cable. A recall affected 2020-2021 models for overheating of the 220V/240V portable charging cable, which was replaced free of charge. The onboard charger module itself can fail, preventing the car from charging even when plugged in. Replacement of the charger module costs approximately €1,500-2,500 at a dealer. While the car remains fully drivable without plug-in charging (it operates as a conventional hybrid), the fuel economy advantage is lost.

The A8 D5 has over 90 electronic control units that should enter sleep mode when the car is parked. If any module fails to sleep, parasitic draw can exceed 100 mA and drain the 12V battery within 3-7 days. This is a well-known characteristic of modern Audi flagship models. Common culprits include the MMI system, comfort entry module, and various driver-assistance sensors. A battery tender (CTEK MXS 5.0 or similar) is strongly recommended if the car sits unused for more than a few days. Replacing the 12V battery costs €200-350, but the root cause (a faulty control module) may need diagnosis at €100-200 per hour.