Audi A4 Repair and Maintenance

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

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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.

Check Engine Light and/or Hesitation Due to Failed High Pressure Fuel Pump

2.0L turbo charged engines may develop a hesitation on acceleration and/or illumination of the Check Engine Light due to a failed high pressure fuel pump or a worn camshaft follower or camshaft. Our technicians tell us that whenever the high pressure fuel pump is replaced the camshaft and the follower should be checked for wear. The camshaft lobe pushes on the follower to operate the high pressure fuel pump. Frequent inspection of the cam and high pressure fuel pump can prevent cam failure.

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. 

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Audi A4 Questions

Should I replace my transmission or dump the car? (1 answer)

I have had over $300 in repairs in the lst 2 years on my Audi 1.8 liter convertible. Now the transmission shakes and the engine light comes on 24/7 I have 130,000 on the car but it is in mint condition sans the engine.

Enging spudders and back fires at WOT. (1 answer)

My 98 has a big turbo kit and sometimes it spudders or hick ups when accelerating/shifting. It also pops/back fires when shifting under load. Why would it start this now? Never had these issues when first bought the car?

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

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Audi A4 Recalls

Side Marker Lights Do Not Illuminate With Parking Lights Or Headlights On

The side marker lights may not illuminate when the headlights or parking lights are on. Dealers will upload revised software to the vehicle to correct the concern free of charge.

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.

Air Bag Control Unit Fails

The air bag control unit may corrode and fail. Dealers will replace the air bag control unit free of charge to resolve the concern.

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Audi A4 Reviews

i have had so many problems with m car but i love it and will pay for whaever reapairs t needs
have an audi 2000 a4 the rain water is pooling in the battery housing and then leaking into the drivers side floor area. the water then goes into the rear floor board. have had the car for several years and have had minimal problems but this new one is frustrating the crap out of me. where is the drain for this area??? any ideas??
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

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