Audi A8: Common problems, reliability and what to look out for

The Audi A8 is the pinnacle of the German automaker’s luxury sedan range, offering a seamless blend of cutting-edge technology, unparalleled build quality, and effortless performance since its introduction in 1994.

Whether you’re considering buying a used A8 for its comfortable ride and executive style, or whether you’re after a high-performance engine with 0-60 mph in under 4 seconds, you’re sure to find the perfect option at a used car dealer. However, like any high-end vehicle, the Audi A8 comes with potential issues, especially if previous owners have neglected regular maintenance.

The Audi A8 can be costly to maintain, so it’s a good idea to check for new or used Audi A8 parts availability online before buying, for peace of mind. From oil consumption issues to suspension faults, knowing the A8’s common problems will help you make the right decision on the forecourt.

What are the most common issues with the Audi A8?

Oil consumption and turbo issues

Some A8 engines, especially those from 2003, 2011 and 2015, are known for excessive oil consumption, particularly in higher-mileage vehicles. Ignoring this issue can lead to catastrophic damage, causing excessive friction, overheated bearings, and ultimately, turbo destruction.

Making sure you maintain a regular oil change routine, using oil recommended by the manufacturer, and monitoring oil pressure can all help mitigate this weakness and avoid problems further down the line.

Timing chain and tensioner issues

Audi A8 models with the 4.2L V8 engine, especially those produced before 2007, experience issues with stretched timing chains or failing tensioners, which can cause a rattling noise on cold starts and even lead to engine failure.

Being proactive with your maintenance routine is crucial if you’re an Audi A8 owner. Inspect the timing chain tensioner for signs of wear and replace it before it fails completely. If you’re purchasing a used A8, check the service history for timing chain replacements.

Air suspension problems

The A8’s adaptive air suspension offers a plush and comfortable ride that’s designed to last the life of the car, but it can sometimes fail prematurely. The electronic control module that controls the air suspension can be prone to software issues, while the air springs can leak, causing the motor to work harder than necessary.

Symptoms of air suspension problems include an uneven ride height, warning lights, or a bouncy drive. Replacing air struts can be expensive, so test the suspension thoroughly before making a purchase.

Gearbox issues

Some A8s, particularly those produced before 2000, suffer from rough shifting, hesitation or leaks in the multitronic automatic transmission. The oil can leak from a faulty join in the oil line, which will need to be replaced. This issue is more prevalent in A8s produced from September to December 2019.

Replacement gearboxes can be costly, so check the service history thoroughly before making a purchase.

Electrical gremlins

From faulty infotainment and sat nav screens to climate control failures and persistent warning lights, electrical issues are common in older Audi A8s. They can be caused by faulty sensors and malfunctioning modules. The battery and alternator can also cause problems with the electrical system.

When you’re test-driving your A8, test all buttons, screens, and functions before you purchase. Look for flickering or dim headlights and interior lights, and check all the dashboards and screens. If you can, inspect the wiring and connections for signs of moisture or corrosion, as this can cause gremlins to exacerbate.

How reliable is the Audi A8?

The A8 enjoys a solid reputation for reliability, and it’s backed up with Audi’s strong track record. While the A8 doesn’t appear in WhatCar?’s latest reliability survey, Audi finishes 12th out of 32 manufacturers, which is a vote of confidence. The smaller A6 scores an excellent 92% for reliability, which bodes well for the A8 as they share much of the same engineering.

While the A8’s advanced technology can be costly to maintain, overall dependability is good, especially if you stick to well-maintained later models from 2015 onwards, and keep up with regular servicing.

For the best balance of luxury and reliability, the 3.0 TDI diesel models tend to be the most durable. Just be sure to check for a full service history and consider an extended warranty for greater peace of mind.

Is the A8 an expensive car to maintain?

It can be, as luxury comes at a cost. Air suspension repairs, timing chain replacements, and replacement engines can run into thousands. Opt for a full-service history and consider an extended warranty for peace of mind.

Fuel consumption can also be more pricey, though the 3.0 TDI is the most economical. The annual vehicle excise duty (VED) tax can be high, but Audi franchise dealers do guarantee a fixed-price servicing deal on models older than three years, which costs between £164 and £319.

Which A8 engine is the most reliable?

The Audi A8 has faced some engine and transmission issues, including a 2013-2017 recall for stalling.

However, it has several dependable years and engine options, with standouts including the 4.2L V8 and the 3.0 TFSI supercharged engine (D4 generation). Choose models from 2015 and 2023 for the most reliable. The 2015 delivers an excellent balance of luxury and value, praised for its advanced tech, powerful engines, and refined ride. The 2023 offers cutting-edge updates in suspension, tech, and safety. While the 2015 model is a cost-effective choice, the 2023 version appeals to those wanting the latest innovations. Both provide exceptional quality and a luxury driving experience.

If dependability is your priority, the 3.0 TDI diesel is one of the most trustworthy engine options, offering an outstanding balance of efficiency and durability.

Don’t forget, though, even the best engines can suffer from neglect, so look for a well-cared-for A8 engine to deliver years of smooth, trouble-free driving. You can expect anywhere between 200,000 and 300,000+ miles in terms of life expectancy. Diesel models often outlast petrol engines. For a maximum lifespan, stick to all your scheduled services and address any minor issues promptly.