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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 muct be removed to access a variety of components below. Here's how to remove it.
     Applies to: 2.7T (1997-2004)
 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)
 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 cuase 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)
 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)
 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)
 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 outisde 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)
 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)
Got more questions? Join us in our Audi Technical Forum Message Board, and ask a question to one of our many automotive experts.
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