2004 Audi A8 problems
The Audi A8 is a full-size luxury sedan manufactured and marketed by the German automaker Audi since 1994. Succeeding the Audi V8, and now in its fourth generation, the A8 has been offered with both front- or permanent all-wheel drive—and in short- and long-wheelbase variants. The first two generations employed the Volkswagen Group D platform, with the current generation deriving from the MLB platform. After the original model's 1994 release, Audi released the second generation in late 2002, the third in late 2009, and the fourth and current iteration in 2017. Noted as the first mass-market car with an aluminium chassis, all A8 models have used this construction method co-developed with Alcoa and marketed as the Audi Space Frame.
A mechanically upgraded, high-performance version of the A8 debuted in 1996 as the Audi S8. Produced exclusively at Audi's Neckarsulm plant, the S8 is fitted standard with Audi's quattro all-wheel drive system. The S8 was only offered with a short-wheelbase for the first three generations, being joined by a long-wheelbase variant for the fourth generation.
D2 (Typ 4D; 1994–2002)
Development
In 1982, Ferdinand Piëch signed an agreement with Aluminum Company of America. The objective was to design and develop a car that would be substantially lighter than any other vehicles in its class (to compensate for the fact that standard all-wheel drive was around 100 kg (220 lb) heavier than competitors' rear-wheel drive). In the late 1980s, it was decided that the target vehicle would be a successor to the V8 (Typ 4C) flagship introduced in 1988. By 1990, a final design by Chris Bird and Dirk van Braeckel was chosen and frozen for series production in mid-1991. In September 1993, the Audi Space Frame (ASF) Concept was unveiled at the 1993 Frankfurt Motor Show (IAA) as a D2 Typ 4D prototype in polished aluminum. Pilot production began in December 1993 and development ended in early 1994, at a total cost of $700 million (£418.1 million).
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Common 2004 Audi A8 problems
The Audi A8, a full-size luxury sedan, has been on the market since 1994 and is known for its blend of luxury and performance. However, some model years have been less than ideal, with common problems affecting their reliability and overall performance. This article focuses on the 2004 Audi A8, highlighting the most common issues reported by owners.
- Water in Footwell: Water in the footwells is a common issue caused by blocked scuttle drains. This problem can be resolved by cleaning out the scuttle drains, which will help prevent water accumulation.
- Electronic Handbrake Problems: The electronic handbrake in the 2004 Audi A8 has been known to remain on when switched off, causing a loss of power or screeching noises from the brake discs. This issue may require replacing the electronic handbrake and possibly the calipers.
- Air Temperature Sensor Failure: The air temperature sensor in the A8 is prone to failure, resulting in inaccurate temperature readings. Fitting a replacement air temperature sensor will resolve this issue.
- MMI (Multi Media Interface) Problems: The A8's MMI system is known for having problems, including software faults and hardware failure. If experiencing MMI issues, it's recommended to have a specialist diagnose and repair the problem, as repair prices can vary.
- Door Micro Switch Failure: Issues with door micro switches can cause the doors to stick, not open or lock properly with the remote key. Replacing the door micro switches will fix this problem.
- Loss of Power Steering: Audi issued a recall for a fluid leak on the return hose for the hydraulic power steering in the 2004 A8. Replacing the return hose with the newly designed hose will resolve this issue.
- Bumpy Driving: The air suspension on the Audi A8 can fail, causing a bumpy driving experience. Replacing the air compressor or the entire air suspension system can resolve this issue.
- Engine Rattle: A heavy rattling sound coming from the engine and excessive vibrations throughout the car can be caused by a deformed engine compartment seal. Installing a retaining plate can resolve this issue.
- Grinding Noise on Gear Changes: A slight grinding noise when changing gears can be caused by gear oil escaping into a faulty welded joint on the gearbox oil line. Audi usually replaces the oil line for free, but if not, it can be easily done with a new hose.
These common problems in the 2004 Audi A8 can significantly impact the vehicle's reliability and overall performance. Proper maintenance and addressing these issues as they arise can help prolong the lifespan of the vehicle and ensure a safer and more enjoyable driving experience.
Is buying a used Audi A8 a good idea?
Audi A8: The Audi A8 is one of the most dependable full-size luxury sedans on the used car market. It also impresses with its powerful engine, outstanding fuel economy, and upscale interior.
How long do Audi A8 engines last?
Audis can go up to 200,000 miles or 20 years without major repairs when they're properly maintained.
Is Audi A8 expensive to maintain?
Maintenance and repair costs for an Audi A8 will amount to $2,843 after 5 years.
Is the Audi A8 a reliable car?
According to whatcar.com, the Audi A8 has a decent reputation for reliability. Some years are terrible, but most come out about average. According to audicomplaints.com, the Audi A8 ranks 7th out of 19 Audi models. It's far from the worst, but it's not even close to the best.
Is the Audi A8 a reliable car?
According to whatcar.com, the Audi A8 has a decent reputation for reliability. Some years are terrible, but most come out about average. According to audicomplaints.com, the Audi A8 ranks 7th out of 19 Audi models. It's far from the worst, but it's not even close to the best.
Is buying a used Audi A8 a good idea?
Audi A8: The Audi A8 is one of the most dependable full-size luxury sedans on the used car market. It also impresses with its powerful engine, outstanding fuel economy, and upscale interior.
Is Audi A8 expensive to maintain?
Maintenance and repair costs for an Audi A8 will amount to $2,843 after 5 years.
How long do Audi A8 engines last?
How Many Miles Does an Audi Last? Audis can go up to 200,000 miles or 20 years without major repairs when they're properly maintained.
2004 Audi A8 complaints
The NHTSA has received 0 complaints about various vehicle components related to the 2004 Audi A8.
You can leave your car complaint via the special form below.
2004 Audi A8 recalls
The National Highway Traffic Safety Administration (NHTSA) has issued 1 recalls for different components of the 2004 Audi A8.
- Manufacturer: VOLKSWAGEN OF AMERICA, INC
- Components: AIR BAGS:FRONTAL
- Summary: ON CERTAIN PASSENGER VEHICLES, DURING PRODUCTION OF THE DRIVER'S FRONTAL AIR BAG, THE AIR BAG MAY NOT UNFOLD PROPERLY IN THE EVENT OF A CRASH AND THEREFORE MAY NOT INFLATE AS DESIGNED.
- Consequence: LOSS OF FRONTAL AIR BAG DEPLOYMENT COULD OCCUR WHICH CAN INCREASE THE RISK OF INJURY IN A FRONTAL CRASH.
- Remedy: DEALERS WILL INSTALL A NEW DRIVER'S FRONTAL AIR BAG FREE OF CHARGE. THE RECALL BEGAN ON OCTOBER 6, 2006. OWNERS MAY CONTACT AUDI AT 1-800-822-2834.
Negative 2004 Audi A8 car reviews
Positive 2004 Audi A8 car reviews
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The car is an absolute gem! It handles so well and loves fast corners. There is plenty of room for a party in the back seats. Although there were some problems with the trunk electric motor, it was replaced. However, it still feels a little sticky. Additionally, the lights sometimes stay on when the car is not locked, which drains the battery. The tire pressure feature on the dash screen always seems to register the same pressure even after inflating the tires more. It's important to watch the curb parking when the suspension is set low as you will always hit the curb when parking nose first against even the lowest of curbs. However, you can easily reset the suspension to lift, wait a few seconds, and clear most of them. The service has been excellent!
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I absolutely love my A9L! It's a real head-turner and definitely stands out from the crowd. The interior details are stunning and the lighting is just knockout. The stereo is wonderful and the back seat is almost like a limo - there's so much space! I remember when I drove one of the first TT coupes in Florida and people would cross 4 lanes of traffic just to get a better look. This car is just as stunning and even my teenage son and his friends are impressed. It's definitely a cool car! Plus, there's plenty of room for 4 bags and 4 golfers in style. I have to say, Audi quality and service are absolutely wonderful and my dealer, Shelton, is A1. I don't mean to gush, but this car is an absolute ego trip for someone who loves to drive!
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I recently purchased my 2004 A8L after owning a 1999 model. I must say, this car is a major advancement over the previous generation car which was already a great car in its own right. The technological advancements in this car are impressive and the interior is almost a work of art. The structure is rock solid with no body flex and the suspension is a perfect balance of comfort and handling. The engine has excellent power and smoothness yet sounds like a performance car when pushed hard. According to the window sticker, this is the most intelligently designed car in the world and I couldn't agree more. As long as Audi continues to build this model, I will definitely own one.
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As someone who previously owned a BMW 745il, I have a good understanding of the differences between the two cars. In terms of performance, the A8l is a strong contender compared to the BMW, but it is the clear winner in terms of looks both inside and out.
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It's great to hear that you're enjoying your new car! Your previous Mercedes S430 was a great car, but it sounds like you made the right choice with the Quatro. It's truly an outstanding vehicle that offers a unique driving experience. Thank you for sharing your thoughts with us!
Additional sources
More sources of information about 2004 Audi A8 problems:
2004 A8L common problems??
Mar 29, 2019 ... It's free and it's easy, so don't hesitate to join the Audizine Family today! If you're new to forums in general, be sure to check out the Forum ...
2004 A8 maintenance / issues thread - AudiForums.com
Jun 16, 2009 ... You basically have to remove the belly pan, un-hook the secondary air pump lines from the air box, un-bolt the air box, and remove the MAF ...
2004 Audi A8 Quattro Problems and Complaints - 7 Issues
Problem with your 2004 Audi A8 Quattro? Our list of 7 known complaints reported by owners can help you fix your 2004 Audi A8 Quattro.
2005 Audi A8 L Reliability : r/Audi
Jul 4, 2022 ... So I'm looking to purchase an A8L that has just under 100,000 miles on it. I am as much concerned about mechanical reliability as I am about ...
2004 Audi A8 Reliability problems - AudiWorld Forums
Jul 26, 2003 ... My problems are very small. Overall the car is terrific. I was one of the first to take delivery in the country I believe (June 3rd.), and with ...
Other years of Audi A8
Are you having problems with your 2004 Audi A8?
Jayce Runte 2025-05-27
We were hoping for Audi's renowned quality and excellent customer service when we purchased this vehicle. Unfortunately, our experience has been quite terrible. We have had to spend over $7,500 on mechanical repairs since 80,000KM. For instance, we had to replace the starter which cost $992.16, and the remote has been dysfunctional despite replacing the batteries five times. Additionally, we had to replace four upper control link bushings which cost $1130.53, and the breather valve atop the manifold cost $240.81. We also had to decarbonize the air intake system which cost $216.57. Last night, the car stopped functioning on HWY 81, requiring towing and stranding us in Wilkes Barre, Penn. We now need to replace the mass air flow sensor, and the cost is unknown. Apparently, it was also misfiring on some cylinders.
Merle Hettinger 2025-05-13
A great car deserves a company that stands behind it. Unfortunately, my experience with this car has been less than ideal. It spent a total of two months in service, with the last 45 days in a row. The car has had computer and transmission problems, which Audi has not been willing to address. The transmission slips and progressively gets worse.
Gideon Prohaska 2025-04-25
This car is so comfortable we call it the sofa. However, it has been a maintenance nightmare. It is constantly in the shop and dealers in northern California uniformly provide lousy but expensive service. When the heater failed while in Minnesota on a winter trip, the dealer groaned when he saw it was a 2004. According to him, it has nothing but headaches. Tons of electrical problems to start with, then the list gets mechanical.
Grayson Hartmann 2025-03-24
Hello! It seems like you have some mixed feelings about your Audi A8. While it is the largest, most comfortable, luxurious and sporty sedan of its year, it may not be the best choice for everyone. Some owners have reported issues with owning, servicing and repairing the car, which can be frustrating. However, it's important to note that every car brand has its own set of challenges. Have you considered looking into Japanese car brands? They may be a great alternative for you!
Norwood Jacobson 2025-03-18
MMI has failed multiple times, including running down the battery and requiring a tow. Despite attempts by the dealership, the issue persists and Audi USA has been unable to provide a solution. It is imperative that this issue is addressed and resolved promptly to restore confidence in the brand.