Audi A8: reliability and common problems
The Audi A8 represents Audi’s luxury flagship saloons, known for their sophisticated technology and comfort. However, the reliability of this model depends heavily on the model year and the level of maintenance. Older generations in particular are prone to expensive failures of the engine, transmission and air suspension. Planning to buy an A8? Then it is wise to inform yourself properly about the potential problems. These are the issues you may encounter.
How reliable is the Audi A8?
The reliability of the Audi A8 varies between the different generations. Models built before 2010 are known for their susceptibility to electronic faults. These cars also struggle with problems affecting the complex air suspension. Later models, built after 2014, generally show better reliability. Even so, these versions remain vulnerable to failures of the MMI system (Multi Media Interface, Audi’s multimedia and control system) and the transmission.
Maintenance plays a major role in the lifespan of the A8. Owners who strictly adhere to the service intervals and use original parts report fewer problems. However, many common complaints cannot always be prevented, especially with cars with higher mileages. Anyone familiar with the common problems with Audi is better able to judge what to look out for.
‘ If this is ignored, it results in severe engine damage. ‘
Engine problems with the Audi A8
The engines in the A8 range from diesels to powerful petrol V6s and V8s. With diesel engines, oil consumption is a frequent issue, especially with the 3.0 TDI version. This leads to damage to the turbo and the catalytic converter if it is not rectified in time.
On petrol models there are complaints about timing chain problems. This occurs mainly with the 3.0 TFSI and 4.2 V8 engines. The timing chain can sometimes wear, leading to a rattling noise when starting. If this is ignored, it results in severe engine damage. When buying a used A8, always check whether the timing chain has been replaced on time.
Other common engine problems are:
- Defective ignition coils causing misfires
- Leaking valves in the PCV system
- Water pump problems at higher mileages
- Coolant leaks due to ageing hoses
Transmission and drivetrain
The eight-speed automatic transmission in the A8 is known for its smoothness. The system also scores highly on comfort. However, some owners report shifting problems, mainly on models built before 2012. These manifest as harsh gear changes or a delayed response when shifting.
The cause often lies in ageing transmission oil. Audi claims the oil lasts the lifetime of the car, but in practice it is wise to replace it every 60,000 kilometres. This often prevents transmission problems. In more serious cases, the mechatronic unit fails, which means an expensive repair.
The quattro four-wheel drive system is generally reliable, but the propshaft and differential bearings wear over time. This causes vibrations while driving.
Chassis and air suspension
The adaptive air suspension is among the most problematic systems in the A8. Owners regularly report that the car sags or displays an error message about the air suspension. The causes are varied:
- Leaking air springs
- Defective compressor
- Faulty ride-height sensors
Replacing an air spring can cost several hundred euros each, and the compressor is even more expensive. When buying, check whether the car sits level and whether any warning lights are illuminated.
In addition, the following component problems occur:
- Worn bushes in the suspension arms
- Failed shock absorbers on older models
- Wear on power steering lines, causing leaks
- Rusty brake discs due to long periods of standing still
‘ This involves high costs and requires specialist knowledge. ‘
Electronic faults and MMI problems
The Audi A8 is equipped with advanced electronics and the MMI system (Multi Media Interface), the multimedia and control system that manages navigation, entertainment and vehicle settings. However, this system regularly glitches, especially on older models. Many owners report that the screen stays black or that the navigation no longer works.
Software updates solve some problems. However, hardware failures in the MMI system require replacement of the unit. This involves high costs and requires specialist knowledge.
Other electronic problems are:
- Defective parking sensors or reversing camera
- Faults in the climate control
- Problems with keyless entry
- Warning messages for bulbs that supposedly do not work
Make sure you test all electrical functions during a test drive, including seat heating, ambient lighting and the audio system.
Other known problems
Besides the major systems, there are smaller but annoying problems that occur regularly. The interior of the A8 is luxuriously finished, but the upholstery wears over time. The steering wheel and seats in particular are prone to ageing.
The bodywork is generally rust-resistant, but check the wheel arches and underside for rust on older models. Paint finish and chrome trim can also become dull through poor cleaning or prolonged exposure to the elements.
Common wear points are:
- Worn window switches
- Broken trim strips
- Leaking headlights due to aged seals
- Problems with the boot lid due to electrical faults
The importance of maintenance
The lifespan of an Audi A8 depends greatly on maintenance. This car requires regular inspections and the use of original parts. Cheaper alternatives may seem attractive in the short term, but often lead to bigger problems.
Stick to the recommended service intervals. For diesel engines, this means checking the DPF filter (diesel particulate filter that removes harmful particles from exhaust gases) and the EGR valve (Exhaust Gas Recirculation, a valve that routes exhaust gases back to reduce emissions). On petrol models, the timing chain requires extra attention. Have the brake fluid checked every year and replaced if necessary.
Invest in a good garage that has experience with Audi models. Generalist garages often underestimate the complexity of the A8, which leads to incorrect diagnoses.
‘ Without this information you risk unexpected and high costs. ‘
What to look out for when buying
Planning to buy a used Audi A8? First of all, check the service history. A fully completed service book gives a good indication of the condition of the car. Without this information you risk unexpected and high costs.
Test the air suspension during the test drive. Drive over a bumpy road and listen for strange noises or check whether the car sits unevenly. Make sure the MMI system functions correctly and that all buttons work.
Ask about previous repairs, paying particular attention to work on the engine and transmission. Have major components been replaced? That often points to structural problems. If possible, have the car inspected by an independent specialist.
Important points to check during inspection:
- Check that all electronic functions work
- Look underneath the car for oil leaks
- Test the transmission for smooth gear changes
- Listen for unusual engine noises
- Check the mileage and compare it with the service history
Luxury with a price tag
The Audi A8 offers comfort and performance, but this model demands careful maintenance and comes with potential costs. The complexity of its systems means repairs are expensive, particularly on the air suspension, transmission and electronics. For those willing to invest in regular maintenance, the A8 is a reliable and pleasant car. Unsure about the condition of a specific car? Always have a thorough inspection carried out first. Only buy afterwards.