2004 Audi A4 Repair and Maintenance

A guide to problems, costs, maintenance and repair for your 2004 Audi A4

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2004 Audi A4 Problems

Engine Misfire Due to Failed Ignition Coil, Spark Plug, or Ignition Wire

An ignition coil or spark plug may fail unexpectedly resulting in an engine misfire and possible illumination of the Check Engine Light. Vehicles equipped with spark plug wires may also develop a misfire caused by a failed spark plug wire.

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. 

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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2004 Audi A4 Questions

Dear Sir/Madam, What could be the cause of the power loss,jerking and cutting o (1 answer)

Dear Sir/Madam,

What could be the cause of the power loss,jerking and cutting on an AUDI A4

tensionner is lose and timing belt (1 answer)

car was knoking.put it on machine it read some thing was rong with tentinoer i took cover off it ,timing belt and tensionner was lose

everytime I brake, i hear a crack sound on the driver side wheel (1 answer)

the sound is just when i brake either hard or smooth. When is really smooth it does not sound. However the sound is quite loud

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2004 Audi A4 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.

Recall 05V096000
ON CERTAIN PASSENGER VEHICLES, THERE IS A POSSIBILITY OF XENON HEADLAMP COATING DEGRADATION OVER TIME. THE LUMINOUS TRANSMITTANCE OF THE HEADLAMP MAY DECREASE OVER A PERIOD OF TIME.

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2004 Audi A4 Reviews

Rated
based on 2 customer reviews
have a 2000 a4, have been having trouble with the rain water pooling in the battery housing and leaking into the interior of the car. the drivers floor is soaked and then the water goes into the rear seat floor board. any ideas on how to fix problem? where is the drain for this area?? sooo very frustrating
just got this car approximately 3 months ago. apparently the TCM is bad. the transmission is very weak and driving at 30 mph the damn car is already on 6th gear. very weak on take off ynless i hit the gas pedle all the way. and even then the transmission is confused. durinig automatic down shift the car transmission kinda bumbs as it goes into first gear. sounds like the TCM (transmission contr...

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