2009 Audi A6 Quattro Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2009 Audi A6 Quattro

Get a Repair Estimate
Guaranteed by certified locations nationwide. Learn more
Get a Repair Estimate For Your 2009 Audi A6 Quattro
RepairPal estimates are guaranteed at over 1,700 quality certified locations nationwide. Learn more

2009 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.

Inspect CV Boots and Joints at Each Service

Our technicians recommend having the constant velocity (CV) boots and CV joints inspected at each service. Servicing torn CV boots early can prevent the need to replace the CV half shaft or CV joint.

See More Problems (6)

2009 Audi A6 Quattro Questions

my satellite radio stopped playing and i have a subscription. (1 answer)

the satellite was working fine and all of a sudden it stopped working. I called Sirius XM and they ran a refresh signal and nothing happened.

I've been having issues with my transmission. Under hard acceleration or (1 answer)

Instances where the transmission has to change years often, I get a warning on the dash saying my transmission has malfunctioned and has limited functionality but the vehicle is safe to drive. Most times the RPM's race up to about 4500-5000 and it feels like the top 2 fears are locked out.

See More Questions (2)