2006 Audi A6 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2006 Audi A6

2006 Audi A6 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. 

Decreased Power and Fuel Economy from Carbon Buildup

The 2006-2016 Audi A6 2.0TFSI, 3.0TFSI, 3.2FSI and 4.2FSI direct injection engines are subject to carbon buildup in the intake system which can cause power loss, OBD codes and a check engine light, and a rough idle. In normal engines, the engine is cleaned by the gasoline flowing through the injectors and into the intake system, however, the A6 uses direct injection so gasoline does not flow through common carbon buildup areas. 

Possible trouble codes include: P0300P0301P0302P0303P0304, P0305, P0306, P0307, P0308

The solution is to remove the intake manifold and professionally clean the intake manifold, intake ports on the cylinder head, and the intake valves. This may need to be done in as few as 20,000 miles. 

Oil leaks from camshaft drive pulleys and variable valve timing hydraulics
Oil leaks from the camshaft drive pulleys and variable valve timing hydraulics are common. If the variable valve timing hydraulics is leaking, the Check Engine Light may illuminate from inaccurate valve timing.

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2006 Audi A6 Questions

ignition is on the engine temperature need reaches 90 (1 answer)

when the ignition is on the temperature reaches to 90. the coolant level is at max. water pump is working fine. temperature sensor is working fine.
what is the reason for this problem. kindly advise . the car reached 195000 km.

i replaced the radiator overflow and put new coolant in and the coolant light (2 answers)

and the coolant light stays on , is there a code or fuse I need to replace, reset and where is this?
thank you

J757 relay location (2 answers)

06 A6 Sedan 3.2Ltr front wheel drive; I need to find the J757 engine compartment power supply relay. Can anyone help me? Email me at ebowen69@eastex.net please!

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2006 Audi A6 Recalls

Passenger Frontal Air Bag Inflator Ruptures On Deployment

The passenger frontal air bag inflator may rupture on deployment, causing metal fragments to come through the air bag and injure occupants. Dealers will replace the passenger frontal air bag inflator free of charge to resolve the concern.

The Power Rear Hatch May Close Unexpectedly

The power operated rear hatch uses gas struts to assist in its opening and also includes a manual close function. If one of the hatch supports were to fail, the software may interpret the slow movement as manual operation and replace the motor clutch. If this were to happen, the hatch would fall, increasing the rick of personal injury. Dealers will update the necessary software to correct this concern. This recall is scheduled to begin on September 14, 2007. The Audi recaqll number is JV.

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