2003 Audi A6 Quattro Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2003 Audi A6 Quattro

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2003 Audi A6 Quattro Problems

No Start after Refueling and Popping Noise from Trunk

Popping sounds from the rear of the vehicle may be heard moments after starting the engine, or when slowing to a stop. This noise is from the leak detection pump filling the fuel tank with air, and releasing to retest the system when it finds a fault. The sequence of faults identifying this issue are as follows:

  • Succession of loud pops from rear of vehicle
  • Pops go away, and fuel economy decreases 
  • Check engine light illuminates
  • OBD trouble code P2404 and/or P0441 is stored
  • Engine will not start after refueling (must crank for over 30 seconds)
  • Vibration when slowing to a stop

The cause is a valve which is mounted on the front of the intake manifold, commonly called the N80 valve, or EVAP system purge valve. The valve is designed to open under specific circumstances, but a worn valve will remain open at all times, preventing the pressurization of the fuel tank. 

Correction of the issue is to replace the N80 valve with the latest revision. 

Check Engine Light and/or Engine Overheating Due to Failed Thermostat

The thermostat may erratically stick open or closed. The can result in illumination of the Check Engine Light and/or engine overheating.

ABS Light Due to Control Module Failure

The anti-lock brake system (ABS) control module may fail causing the ABS light to illuminate. Failed modules should be replaced to restore ABS operation.

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2003 Audi A6 Quattro Questions

Changed ignition car starts and dies didn't before (1 answer)

Is there a chip in a 2003 Audi didn't look it what alse you have to do when changing a ignition

Front end vibrates and rattles between 60 - 70 mph. (1 answer)

Also is wearing my tyres out prematurely. I think maybe the stearing rac may need rebuilt. I need confirmation from someone who has had experience with Audi's in the past and who may have an idea on cost.

why won't my car start?????? (2 answers)

Car was running amazing. Shut it off in my driveway for a minute. I just got the car so i wanted to start it up again. But when i turned the key a weird noise came from the fuse area and won't even turn over. The battery is charged and radio/headlights, etc all work. I have no idea what the p...

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2003 Audi A6 Quattro Reviews

Rated
based on 2 customer reviews
I love this car
I own an 03 A6 4.2Qtr.Sports Pkg.Great SLEEPER!!!Quality of engineering shows thru & thru what with an interior fit & finish & classic styling that's ageless @92kmiles. Need chunky c/crd for repair costs.Premature suspension & control link bushings wear.Need accurate diagnosis to fix.ABS/VSA lights flash.Have replaced module once $1700.00.Car smells like its burning oil but not based on dip-st...

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