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2004 Audi A6 Overview, Reviews, Ratings & Specs

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Cathleen V | March 31, 2025
The 2004 Audi A6 is a mid-size luxury sedan representing the second generation (C5) of the A6 model. Available as a sedan or wagon (Avant), it was offered from 1998-2004. Key trims include the 2.7T, 3.0, and 4.2. Pricing ranged from approximately $30,000 to $50,000 when new. The A6 was popular for its sophisticated styling, comfortable ride, and available quattro all-wheel drive, offering a premium driving experience.
The Good

The 2004 Audi A6 offers a blend of performance and luxury. Emotionally, it provides a prestigious brand image and enjoyable driving dynamics, especially with quattro. Practically, its comfortable interior, refined design, and available all-wheel drive make it a solid choice. Performance from the available V6 or V8 engines is ample, and fuel efficiency is reasonable for its class.

The Bad

The 2004 Audi A6, while generally reliable, has some potential weaknesses. These include potential issues with the timing belt (particularly in the 2.7T), automatic transmission problems, and electrical gremlins. Suspension components and control arms are known to wear out. Regular maintenance is crucial to prevent major repairs.

2004 Audi A6: Quick Overview

Here's a summary of the key specifications for the 2004 Audi A6:

  • Engine Options:
    • 2.7L Twin-Turbo V6 (2.7T): Available in various states of tune.
    • 3.0L V6: Naturally aspirated.
    • 4.2L V8: Offered in the A6 4.2 quattro.
  • Horsepower:
    • 2.7T: Ranging from 250 hp.
    • 3.0L V6: Approximately 220 hp.
    • 4.2L V8: Approximately 300 hp.
  • Fuel Economy (estimated):
    • 2.7T: 17 mpg city / 25 mpg highway.
    • 3.0L V6: 18 mpg city / 26 mpg highway.
    • 4.2L V8: 15 mpg city / 22 mpg highway.
  • 0-60 Times (estimated):
    • 2.7T: Around 6.5 seconds.
    • 3.0L V6: Around 8 seconds.
    • 4.2L V8: Around 6 seconds.
  • Towing Capacity:
    • Not officially rated for significant towing. Generally, light utility trailers are acceptable, but check owner's manual for specific limitations.
  • Trim-Level Features:
    • Base (2.7T/3.0): Leather seats, sunroof, automatic climate control, premium sound system.
    • Quattro: All-wheel drive system.
    • A6 4.2: Upgraded leather, sport suspension, upgraded interior trim, premium audio system.
    • Avant (Wagon): Adds increased cargo capacity and a rear wiper/washer.

2004 Audi A6 Specifications

Vehicle Information
Year 2004
Make Audi
Model A6
Trim -
Style 2.7-T
Type Sedan
Category Mid-Size Car
Manufacturing Details
Made In Germany
Manufacturing City NECKARSULM
Dimensions
Doors 4-Door
Curb Weight 3958 pounds
Gross Vehicle Weight Rating -
Overall Height -
Overall Length -
Overall Width -
Wheelbase Length -
Standard Seating -
Engine & Performance
Engine 2.7-L V-6
Engine Size 2.7L
Engine Cylinders 6
Transmission 5-Speed Automatic
Transmission Type Automatic
Transmission Speeds 5-Speed
Drivetrain All-Wheel Drive
Additional Features
Anti-Brake System -
Steering Type -
Pricing
Manufacturer Suggested Retail Price (MSRP) $35,950
Invoice Price $32,439
Delivery Charges $720

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Analysis

What Problems Does the 2004 Audi A6 Have?

The 2004 Audi A6, while a luxurious car, has several frequently reported problems and long-term reliability concerns. A common issue, especially with the 2.7T engine, is timing belt failure. If the timing belt isn't replaced at recommended intervals (typically every 75,000-100,000 miles), it can lead to catastrophic engine damage. Automatic transmission issues, including slipping or harsh shifting, are also reported. Suspension problems, particularly with the control arms and bushings, are another area of concern, leading to excessive wear and alignment issues.
Electrical problems are not uncommon, with reports of malfunctioning sensors, faulty displays, and issues with the central locking system. The 2004 model year, in particular, saw some recalls related to airbag systems and fuel leaks, so checking the vehicle's recall history is essential.
Long-term, oil leaks can develop, and the catalytic converters may require replacement as they age. Regular maintenance, using quality parts, and addressing issues promptly can help mitigate these concerns, but potential buyers should be aware of these common problems and factor them into their purchase decision and budget.

How long will the 2004 Audi A6 last?

A well-maintained 2004 Audi A6 can reasonably achieve 200,000 miles or more. Years of service can easily exceed 20 years if properly cared for. However, long-term durability hinges significantly on maintenance. Neglecting scheduled services, especially timing belt replacements and fluid changes, will drastically shorten its lifespan. Common long-term weaknesses include wear and tear on suspension components, potential for oil leaks, and increasing likelihood of electrical problems as wiring and connectors age. Rust can also be a factor in regions with harsh winters and road salt use. Regular inspections and proactive maintenance are crucial for maximizing longevity.

What Technology & Safety Features are Included?

The 2004 Audi A6 came equipped with a decent level of technology for its time. Standard features included a premium sound system (often Bose), automatic climate control, power windows and locks, and keyless entry. Entertainment was typically provided by a cassette player with an in-dash CD player; navigation was an optional feature with a screen integrated into the dashboard.
Driver-assistance features were limited compared to modern vehicles. ABS (Anti-lock Braking System) and traction control were standard. Some models included optional parking sensors. Safety features included front and side airbags, and seatbelt pretensioners.
Crash-test ratings from the NHTSA (National Highway Traffic Safety Administration) and IIHS (Insurance Institute for Highway Safety) should be checked for specific results, but generally the A6 performed well in crash tests for its era. Features like quattro all-wheel drive also enhanced safety in inclement weather.
Optional features included a sunroof, upgraded leather upholstery, heated seats, and xenon headlights. While it lacks the advanced driver-assistance systems of newer cars, the 2004 A6 offered a solid level of safety and convenience features for its time, particularly in higher trim levels.

What Colors Options are Available?

Exterior Colors
Brilliant Black
Arctic White
Atlas Gray Metallic
Ocean Blue Pearl Effect
Melange Beige Metallic
Interior Colors
Ebony
Gray
Beige

2004 Audi A6 Prices and Market Value

When new, the 2004 Audi A6 ranged from approximately $30,000 to $50,000, depending on the trim level and options. Currently, used market prices vary widely based on condition, mileage, and location. Expect to find them ranging from $3,000 to $8,000 or even lower for high-mileage or poorly maintained examples. Depreciation has been significant, as is typical for luxury vehicles.
Factors affecting resale value include the overall condition, service history, presence of quattro, and desirable options like navigation or a premium sound system. Models with documented maintenance and low mileage command higher prices. The reputation for potential maintenance issues also impacts resale value negatively.

2004 Audi A6 Cost of Ownership

The 2004 Audi A6 is generally considered costly to own compared to mainstream cars. Insurance premiums can be higher due to its luxury status and potential repair costs. Fuel economy is moderate, but premium fuel is recommended, increasing expenses. Maintenance and repair costs are significant, especially for specialized parts and labor. Routine maintenance like oil changes and brake replacements are relatively affordable, but larger repairs can be expensive. Overall, budgeting for higher-than-average ownership costs is crucial.

2004 Audi A6 Fuel Efficiency

Fuel Type Gasoline
Fuel Capacity 19 gallons
City Mileage 16 miles/gallon
Highway Mileage 23 miles/gallon

2004 Audi A6 Safety Rating

NHTSA
Side Driver Rating
Frontal Passenger Rating
Rollover Rating
Side Rear Passenger Rating
Frontal Driver Rating
IIHS
Rear Crash Protection/Head Restraint Ratings Not Tested
Moderate Overlap Front Test Results Acceptable
Side Impact Test Results Not Tested

2004 Audi A6 Recalls & Defects

Electrical System
Recall date 2004-03-18
Recall no. 04v133000
Source NHTSA
Summary ON Certain Passenger Vehicles, IF A Driver's Knees Push Against THE Knee Bolster (Crash Element) Located Under THE Dashboard, IT CAN Contact THE Headlight Switch Wiring Harness, and AN Electrical Short Could Occur.
Consequence A Fire Could Originate IN THE Left Dashboard Area.
Remedy Dealers Will Install A Protective Covering ON THE Knee Bolster (Crash Element). IN Addition, THE Wiring Harness AS Well AS THE Felt Protector ON THE Left Side OF THE Dashboard Carrier Will BE Checked, and Replaced IF Necessary. THE Recall Began ON July 26, 2004. Owners Should Contact Audi AT 1-800-822-2834.
Notes Customers CAN Also Contact THE National Highway Traffic Safety Administration's Auto Safety Hotline AT 1-888-Dash-2-dot (1-888-327-4236).
Electrical System
Recall date 2006-06-05
Recall no. 06v198000
Source NHTSA
Summary ON Certain Passenger Vehicles Equipped With Halogen Low Beam Headlights, Certain Connector Pins IN THE Headlight Switch Connector Come Into Contact With Each Other Causing A Short Circuit. Note: Vehicles With Xenon Low Beam Headlights ARE NOT Affected Because THE Circuit IN These Vehicles Contains A Fuse, Which Precludes Excessive Current Flow IN THE Case OF A Short Circuit. Audi S6 and S6 Avant Vehicles ARE All Equipped With Xenon Low Beam Headlights And, Therefore, ARE NOT Longer Affected BY This Recall.
Consequence This Condition Could Lead TO Overheating or Fire.
Remedy Dealers Will Reroute THE Wiring Harness BY Installing A Jumper Wiring Harness. THE Recall Began ON December 16, 2006. Owners MAY Contact Audi AT 1-800-822-2834.
Notes Volkswagen (Audi) Recall NO. Jn.customers MAY Also Contact THE National Highway Traffic Safety Administration's Vehicle Safety Hotline AT 1-888-327-4236 (Tty 1-800-424-9153), or GO TO Http://Www.safercar.gov.
Fuel System, Other:storage:tank Assembly
Recall date 2011-05-03
Recall no. 11v267000
Source NHTSA
Summary Volkswagen IS Recalling Certain Model Year 2001-2004 Audi A6, Model Year 2002-2003 S6 and Model Year 2003 RS6 Vehicles Equipped With 4.2l Engines and Manufactured From June 19, 2001, Through June 8, 2004. THE Aging OF THE Plastic Material IN THE Fuel Tank Rollover Valve Combined With Bending Stress From THE Aluminum Ventilation Line TO THE Rollover Valve Nipple MAY Lead TO Cracking OF THE Nipple. IF This Happens, A Fuel Leak MAY Result.
Consequence A Fuel Leak IN THE Presence OF AN Ignition Source Could Lead TO A Vehicle Fire.
Remedy Dealers Will Reinforce THE Nipple ON THE Rollover Valve TO Prevent Leakage or Repair THE Cracking AT THE Nipple. THE Recall IS Expected TO Begin During June 2011. Owners MAY Contact Audi AT 1-800-822-2834.
Notes Volkswagen Safety Recall NO. 20l8/Jy.owners MAY Also Contact THE National Highway Traffic Safety Administration's Vehicle Safety Hotline AT 1-888-327-4236 (Tty 1-800-424-9153), or GO TO <A Href=http://www.safercar.gov>http://www.safercar.gov</a> .
Fuel System, Gasoline:storage:tank Assembly
Recall date 2008-04-08
Recall no. 08v157000
Source NHTSA
Summary Volkswagen IS Recalling 68,240 MY 2001-2004 Audi A6 Quattro Vehicles Equipped With 2.7l, 2.8l, or 3.0l Engines and MY 2001-2005 Allroad Quattro Vehicles Equipped With 2.7l or 4.2l Engines. THE Aging OF THE Plastic Material IN THE Fuel Tank Rollover Valve Combined With Bending Stress From THE Aluminum Ventilation Line TO THE Rollover Valve Nipple MAY Lead TO Cracking OF THE Nipple. IF This Happens, A Fuel Leak MAY Result.
Consequence A Fuel Leak IN THE Presence OF AN Ignition Source Could Lead TO A Vehicle Fire.
Remedy Dealers Will Reinforce THE Nipple ON THE Rollover Valve TO Prevent Leakage or Repair THE Cracking AT THE Nipple. THE Recall Began ON June 27, 2008. Owners MAY Contact Audi AT 1-800-822-2834.
Notes VW Recall NO. 20l8/Jy.customers MAY Contact THE National Highway Traffic Safety Administration's Vehicle Safety Hotline AT 1-888-327-4236 (Tty: 1-800-424-9153); or GO TO Http://www.safercar.gov.

2004 Audi A6 Insurance

Insurance for a 2004 Audi A6 is moderately priced, reflecting its status as a Sedan with strong safety ratings and
reasonable repair costs.

How Does the 2004 Audi A6 Compare to Other Sedan?

The 2004 Audi A6 competed with rivals like the BMW 5-Series (E39/E60), Mercedes-Benz E-Class (W211), and Lexus GS. In terms of performance, the A6 offered comparable power and handling to the BMW and Mercedes, especially with the 2.7T and 4.2 engines, while the Lexus GS offered a smoother, less sporty experience. Feature-wise, the A6 was generally well-equipped, though the BMW and Mercedes offered more advanced technology options at the time.
Reliability is where the A6 lagged behind some competitors. The Lexus GS is known for its superior reliability, making it a potentially better alternative for those prioritizing dependability. The BMW and Mercedes can also be prone to similar maintenance issues as the Audi, but parts availability might be slightly better in some cases.
Price-wise, the used A6 is often more affordable than comparable BMW or Mercedes models due to its reliability reputation. However, the Lexus GS, while potentially more expensive upfront, could offer lower long-term ownership costs due to its reliability. Similar alternatives would be the Acura TL or Volvo S60, depending on preferences for sportiness vs. luxury.
For someone prioritizing reliability and lower long-term costs, the Lexus GS is a strong alternative. If driving experience is paramount and the budget allows for potential repairs, the BMW 5-Series remains a compelling choice.

Ranks #1252 Sedan

1 2023 Toyota Camry (5.0★)
2 2023 Honda Accord (0.0★)
3 2023 Lexus ES (0.0★)
4 2024 Subaru Legacy (5.0★)
5 2022 Mazda MX-30 (4.0★)
6 2024 BMW M3 (0.0★)
7 2023 Ford Mustang (5.0★)
8 2023 Mercedes-Benz AMG GT (0.0★)
9 2023 Audi A3 (0.0★)
10 2023 Chevrolet Camaro (5.0★)
11 2023 Hyundai Elantra Hybrid (0.0★)
12 2023 Nissan Altima (4.0★)
1252 2004 Audi A6 (0.0★)

Final Verdict: Is the 2004 Audi A6 a Good Sedan?

The 2004 Audi A6 is ideal for someone seeking a comfortable and stylish mid-size luxury sedan at an affordable price point in the used market. It's worth buying *if* you are aware of its potential maintenance needs and are prepared to invest in preventative care. It is not a 'buy and forget' car. Specific trims to consider are the quattro models for enhanced handling and all-weather capability. Avoid neglected examples and prioritize those with documented service history, especially timing belt replacements. The 3.0 V6 may offer better reliability than the 2.7T. Be sure to have a pre-purchase inspection by a qualified mechanic familiar with Audi vehicles to assess its condition.

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Cathleen V

Cathleen is an exceptional freelance writer covering hot topics in the automotive world from a gearhead's perspective. Her articles delve into various aspects of automotive technology and history, offering readers detailed insights into engine performance, reliability, and maintenance. Through her engaging and informative writing, Cathleen provides valuable information to automotive enthusiasts and consumers alike, helping them make informed decisions about vehicle maintenance and purchases.