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Audi Home > Audi Technical Articles > Audi A6 (C5 1997-2004) Technical Articles
  

Audi A6 (C5 1997-2004)
Tech Articles

Welcome to our Audi A6 (C5) Technical Articles section. We've gathered a vast collection of useful articles to help you perform many repairs and upgrades on your Audi. Save money by doing your own work and perform the repairs using the information we've provided here. Can't find what you're looking for? Try our search engine, or check out our Enthusiast Forums - focusing on maintenance and repair projects for all Audis! If you'd like to submit a tech article based on your own experience, contact us here!

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Jump to: Basics | Engine | Cooling System | Fuel Injection | Electrical | Suspension | Body & Interior | Miscellaneous

 Basics & Essentials
Charging and Jump Starting your A6
Dead battery? Need to charge or jump your A6? Look here.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Cabin Air Filter Replacement
Interior smelling bad? That musty smell is usually due to a clogged cabin filter. Here's how to change it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Deciphering VIN Numbers
Ever wonder what the VIN numbers actually mean? Here you go.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Air Filter Replacement
The air filter on your Audi should be inspected or replaced every 10,000 miles. Here's how it is done.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Wiper Blade Replacement
Wiper blades wear out over time. Here's how to replace them yourself.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Jacking Up Your Audi A6
Need some pointers on jacking up your Audi A6? Read our article to learn how.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
 Engine
Engine Cover Removal
Pretty much every job on the 2.7T requires the engine cover to be removed. Here's how it's done.
     Applies to: 2.7T (1997-2004)
Diverter Valve Replacement
A leaking diverter valve can cause problems with overall running. Here's how to replace it.
     Applies to: 2.7T (1997-2004)
Upper Intake Plenum Removal
The C5 Audi A6 with the 2.7T engine has an upper intake plenum that must be removed to access a variety of components below. Here's how to remove it.
     Applies to: 2.7T (1997-2004)
Spark Plug and Coil Pack Replacement
One of the most common maintenance jobs to perform is replacing coil packs and spark plugs. Here's how to do it.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02)
 Cooling System
Coolant Expansion Tank Replacement
The coolant expansion tank is prone to failure after many years of use. Here's how to replace it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
 Brakes
Rear Brake Pad Replacement
In this article, I'll show you how to replace the rear brake pads on your C5 Audi A6.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Front ABS Sensor Replacement
ABS light come on yet again? The problem may be a faulty ABS sensor.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Front Brake Pad Replacement
Sooner or later, you'll need to replace your front brake pads. Here's how to do it.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Front Brake Disc Replacement
You'll need to change those front brake discs out at some point- we'll show you how with the help of this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Rear Brake Disc Replacement
At some point it'll be time to replace those rear discs. We'll show you how in this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
BRAKES Brake Bleeding
Learn how to properly bleed your brakes with the help of this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Brake Line Replacement
We'll show you how to replace the brakes lines on the Audi A6 in this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
 Fuel Injection
Engine Management Systems
This article goes over the basics of engine management systems for the A6.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
MAF Sensor Replacement
A MAF sensor fault can cause all sorts of problems. Here's how to change the MAF yourself.
     Applies to: 2.7T (1997-2004)
Throttle Body Cleaning
Often times, cleaning the throttle body can make a poorly running engine run like new. Here's how to do it.
     Applies to: 2.7T (1997-2004)
Accelerator Pedal Module Replacement
A bad accelerator pedal module can leave you stranded. Here's how to replace the module yourself.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Boost Pressure Sensor Replacement
A bad boost pressure sensor can cause you to lose power and mileage on the A6 2.7T. Here's how to replace it yourself.
     Applies to: 2.7T (1997-2004), 2.8 (n/a-a), 3.0L (n/a-a), 4.2 (n/a-a)
Leak Detection Pump Replacement
A typical failure on the C5 Audi A6 is the leak detection pump, which is part of the emissions system. Here's how to replace it yourself.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Boost Pressure Control Valve Replacement
Irratic performance? It may be your boost pressure control valve. We'll show you how to replace in this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Fuel Pressure Regulator Replacement
We'll show you how to swap out your fuel pressure regulator with the help of this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
EGR Vacuum Solenoid Replacement
In this article, I'll go over the steps involved with replacing the EGR Vacuum Solenoid.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
 Electrical
Service Light Indicator Reset
The "Service" message on the dashboard can be irritating at times. Here's how to reset it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Battery Replacement
Batteries wear out over time. Here's how to replace it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Reading Fault Codes
This article goes over the basics of extracting diagnostic trouble codes from your car.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Headlight Switch Replacement
Headlight switches wear out, it's a fact of life. In this article I'll you how to replace it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Dimmer Switch Replacement
The dimmer switch is prone to failure over the years. Here's how to replace it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Side Mirror Switch Replacement
The side mirror is prone to damage due to its location. Here's how to replace the switch.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Brake Light Switch Replacement
The brake light switch is one of those items that will fail eventually. Here's how to replace it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Headlight Assembly Replacement
The headlight assemblies must be removed to access the headlight bulbs. Here's how to remove and or replace them.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Ignition Switch Replacement
The electrical portion of the ignition switch can wear out over time, causing all sorts of electrical glitches. Here's how you replace it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Ignition Control Module Replacement
The ignition control module controls the ignition sequence for each bank of cylinders on the 2.7T. Over time, the modules can wear out. Here's how you replace them.
     Applies to: A6 2.7T (1997-04)
HVAC Blower Motor Fan and Regulator Replacement
The HVAC blower fan and regulator can wear out over time, leaving your climate control system from working correctly. Here's how to replace them.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Turn Signal Combination Switch Replacement
The turn signal/wiper combination switch is prone to wear and tear over the years, eventually resulting in a switch that no longer works. Here's how you replace it.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Clockspring Replacement
The clockspring can wear out over time, leading the SRS system to not function. Here's how to replace the clockspring yourself.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
License Plate Light Replacement
Don't get caught off guard- we'll show you how to replace your license plate bulbs in this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Headlight and Tail Light Bulb Replacement
All head and tail light bulbs eventually die. Here's how to change them on the A6.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Headlight Level Sensor Replacement
We'll show you how to swap out that faulty headlight level sensor with the help of this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Fog Light Replacement
Learn how to replace that burned out fog light with the help of this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Oil Change
The most basic of maintenance items. Learn how to change the oil in your A6 here.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Main Window Switch Replacement
Window not going up or down? We'll show you how to replace that window switch.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
 Suspension
Steering Wheel Removal
Want to update your factory steering wheel or gain access to the components underneath? Here's how it's done.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Power Steering Fluid Reservoir Replacement
Stop the leaks and learn how to replace that power steering reservoir today!
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Front Sway Bar End Link Replacement
Bad sway bar end links can lead to poor handling. Here's how to replace them.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
 Body & Interior
Hood Shock Replacement
Hood shocks wear out, it's just a matter of time. Here's how to replace it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Cowl Panel Removal
The cowl panel must be removed to access some items underneath. Here's how you remove it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Trunk Lid Shock Replacement
Are you tired of having the trunk lid fall on your head? Here's how to replace the shocks.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Replacing Rear Emblems and Rear Script
A quick way to improve the appearance of your car is to replace the rear emblems. Here's how it's done.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Gauge Cluster Removal
The gauge cluster must be removed to gain access to the instrument bulbs and also the center display. Here's how to remove it.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Headlight Lens Refinishing
Over time the plastic headlight assemblies can oxidize and "fog" up. Sometimes, you can refinish the outside of the lens and make it look like new. Here's how.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Lower Dashboard Panel Removal
The lower dashboard panel must be removed for access to components underneath. Here's how its done.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
Airbag Replacement
The airbag can fail to operate after many years of service. If you need to remove or replace the airbag, here's how its done.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Turn Signal Combination Switch Replacement
The turn signal/wiper combination switch is prone to wear and tear over the years, eventually resulting in a switch that no longer works. Here's how you replace it.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Glovebox Removal
The glovebox needs to be removed in order to access some of the HVAC components underneath. Here's how it is done.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Rear Wheel Liner Removal
Some projects on the C5 Audi A6 require removal of the rear wheel liners. Here's how you do it.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Steering Column Cover Removal
Certain jobs on the A6 require the steering column to be removed from the car. Here's how its done.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Front Grille Replacement
Over time, your vehicle's grille can be damaged by rocks and other debris. Here's how you replace it.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Front Wheel Liner Removal
Certain jobs on the A6 require the front wheel liners to be removed. Here's how you do it.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Tail Light Lens Replacement
In this article we'll go over the steps involved in replacing your tail light lens.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Front Undertray Removal
Learn how to remove your front undertray with the help of this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Side Mirror Glass Replacement
Broken door mirror? We'll show you how to replace it in this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
Dashboard Cupholder Replacement
Learn how to replace your dashboard cupholder with the help of this article.
     Applies to: A6 2.7T (1997-04), A6 2.8 (1997-02), A6 3.0L (2002-04), S6 4.2 (1997-04)
 Miscellaneous
Checking Air Conditioning Refrigerant Levels
A/C not blowing cold anymore? It is possible to diagnose the system your self. Here's how.
     Applies to: 2.7T (1997-2004), 2.8L (1997-2002), 3.0L (2002-2004), 4.2L (1997-2004)
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