2006 Audi S4 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2006 Audi S4

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2006 Audi S4 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. 

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.

Check Engine Light Due to Faulty Torque Converter

A problem with the torque converter can cause the Check Engine Light to illuminate.

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2006 Audi S4 Reviews

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based on 1 customer reviews
I purchased my first amazing Audi S4 new in July of 2006. My S4 came with the tiptronic automatic transmission. I drove this excellent car for 148,844 miles. Other than normal maintenance, I had to replace the headlights because of flickering problems at about 100,000 miles, and had to replace all coils at about 95,000 miles. These were the only two major repairs the car sustained. Today,...

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