Audi's flagship plug-in hybrid combines the 3.0 V6 TFSI with an electric motor for a combined 449 PS (462 PS after the 2022 facelift), paired with an 8-speed tiptronic and quattro AWD. The original car carried a 14.1 kWh battery; the facelift moved to 17.9 kWh gross, 14.4 kWh net, which Audi described as significantly more than before. Electric-only range is around 40-50 km. As a full-size luxury sedan on the MLB evo platform, it shares the D5's adaptive air suspension, dual-touchscreen MMI, and extensive driver-assistance technology. Facelifted in 2022 with the enlarged battery and minor styling updates, and no longer factory orderable by 2026.· more· less
PHEV adds high-voltage complexityAir suspension expensive to repair
Buy if: You want a plug-in hybrid luxury sedan for mixed driving and can budget for flagship-level repair costs when PHEV and air suspension systems age.
Avoid if: You rarely charge the car (negating the hybrid benefit) or cannot absorb surprise repair bills for high-voltage battery, air suspension, or 48V electronics.
Air spring bellows develop cracks over time, causing the car to sag overnight or drop on one corner · more· less
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.
48V belt starter generator failure
up to €3,0002 of 7
The integrated starter generator fails, leaving the car stranded or causing charging system warnings · more· less
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.
High-voltage PHEV battery degradation or fault
up to €12,0003 of 7
The plug-in hybrid battery loses capacity over time or develops cell-level faults · more· less
The 60 TFSI e carries a lithium-ion battery pack in the rear: 14.1 kWh on the original car and 17.9 kWh gross, 14.4 kWh net, from the 2022 facelift. 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's European terms cover the HV battery for 8 years or 160,000 km against defects in materials or workmanship, and state expressly that a reduction in capacity is not a covered defect; the 70 percent capacity undertaking applies to battery electric cars, not to this plug-in hybrid. 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.
MMI infotainment system malfunction
up to €3,5004 of 7
Dual-touchscreen MMI system freezes, goes black, or enters a reboot loop · more· less
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.
EA839 V6 piston/engine concerns
up to €15,0005 of 7
The EA839 3.0 TFSI has documented piston design weaknesses, though failure rate remains below 5% · more· less
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.
Charging system or onboard charger fault
up to €2,5006 of 7
The PHEV charging port, cable, or onboard charger develops faults preventing plug-in charging · more· less
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. The 220 and 240 volt portable charging cable action that is often quoted here covers North American charging equipment, so ask the dealer what the VIN returns for the car’s own market rather than assuming a free cable replacement. 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.
12V battery drain from complex electronics
up to €5007 of 7
The car's many electronic modules fail to enter sleep mode, draining the 12V battery within days · more· less
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.
Capable luxury PHEV, but layered complexity demands careful budgeting
The A8 60 TFSI e combines a proven V6 with PHEV technology on an already complex flagship platform. The 3.0 TFSI engine is generally robust, and many owners report trouble-free ownership with regular maintenance. However, the combination of adaptive air suspension, 48V mild hybrid electronics, plug-in hybrid high-voltage systems, and extensive infotainment technology creates multiple potential failure points. Budget for higher-than-average maintenance and keep a repair fund for air suspension and electrical systems. The 8-year HV battery warranty provides some protection for newer examples.
Service history
Complete Audi dealer or qualified specialist records essential. Verify oil changes at recommended intervals.
Tires
Check tread depth, age (date codes), and uneven wear patterns. Rear tires may wear faster due to weight distribution.
Cold start
Start the engine cold. Listen for unusual noises from the V6. Check that the hybrid system initializes without warnings.
Test drive
Minimum 30 minutes including city and highway driving. Test EV mode, hybrid mode, and full-power acceleration.
Specific for this vehicle
Check air suspension ride height on all four corners
Park on flat ground and observe whether the car sits level. Look underneath for signs of oil misting on the air struts. After the test drive, check again for any corner that has dropped.
Verify HV battery state of health
Check the displayed electric range on a full charge. If it shows significantly less than 35 km (pre-facelift) or 45 km (post-facelift), the battery may have degraded. Request a dealer battery health report if possible.
Test plug-in charging function
Plug the car in and verify it begins charging without errors. Check the charging port for damage, corrosion, or locking mechanism issues.
+ 3 more checksShow less
Scan for stored fault codes with VCDS/OBDeleven
A full diagnostic scan can reveal issues across all 90+ control modules. Pay particular attention to hybrid system, 48V system, air suspension, and MMI fault codes.
Test both MMI touchscreens thoroughly
Press all buttons and swipe through menus. Check for frozen screens, delayed response, or phantom touches on either display.
Verify all recalls completed
Check with Audi using the VIN for recall status. Key recalls are the rear axle lock nut (42L1), its follow-up 42L5, the ECM sealing pin (97EV) and the HV battery (15663R).
Recalls and Technical Service Bulletins
Rear axle control arm lock nut stress corrosion, recall 42L1, 2019-2021 productionVerify completed
Repeat action 42L5 for cars previously repaired under 42L1, incorrect rear alignment causing severe tyre wear and sudden pressure lossVerify if applicable
Contact Audi with the VIN to verify all recalls have been completed. The high-voltage battery recall (KBA 15663R) is particularly important for PHEV models due to fire risk. Four campaigns often listed against this car are North American and do not by themselves establish European applicability: the 220 and 240 volt charging cable action covers North American charging equipment, the seat belt retractor and passenger airbag actions were United States and Canada compliance campaigns, and the display action covers the instrument panel rather than the infotainment screen and is a United States campaign.
Warranty Status
Factory warranty (2 years)Expired on most used examples
High-voltage battery warranty8 years / 160,000 km on specified battery component defects; capacity loss is not covered on a PHEV
Rust perforation warranty12 years
Extended warrantyAvailable through Audi dealers, pricing varies
Most used A8 60 TFSI e models are outside the standard 2-year factory warranty. However, the high-voltage battery retains its separate 8-year / 160,000 km cover against component defects, which may still be active on 2019-2022 models, and which does not extend to capacity loss. Verify exact coverage dates with Audi using the VIN.
Sources: Research draws on model-specific owner forums and owner communities, recall information from official authorities, German automotive press, and multiple workshop cost references cross-checked against each other.
This report is for informational purposes only and does not constitute professional advice. Estimates may be inaccurate. Always have a qualified specialist inspect the vehicle before purchase. We accept no liability for decisions made based on this information.
