Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

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really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
1 / 0
Average Mileage:
50,239 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Audi A4 engine problems

engine problem

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2004 Audi A4 Owner Comments

problem #11

Nov 262014

A4 4-cyl

  • 90,700 miles


Was driving on freeway for a few hours during which car was running fine, and car suddenly lost power just after I got off freeway and approached a mountain road incline. There was no warning light, or prior symptoms to engine failure, it just stopped. With help, I was able to get car out of the middle of the road and to safety. Tried to troubleshoot, used engine error code reader, and no fault codes found. Performed basics checked for potential fuel vapor lock due to altitude; checked oil, coolant and fuel levels- and all levels were ok. Battery was functioning - as radio, lights worked. Car has been consistently serviced and maintenance was current. Car was towed to nearest dealer, diagnosis by dealer fuel pump failure due to clogged fuel filter. My issue is that Audi does not indicate service maintenance for fuel filter. There is not any maintenance recommendations or guidance in either the owner's manual or published list of recommended services to replace or check filer. There also were not any warning lights, fault codes or indications to watch for. I feel that it is negligent of the manufacturer to not indicate any service interval to change fuel filter in order to prevent fuel pump failure, and to ensure the safe operating conditions of the vehicle. The car lost power on a winding mountain road and put me at danger without warning. I am curious if this fuel pump incident could be associated with known fuel pump issues, NHTSA #PE08027. Key side notes, while I am the second registered owner, this car was purchased by my father who was the original owner, but for insurance and registration purposes the vehicle was transferred over to me, but I have all original records of the vehicle and can verify all maintenance services have been performed.

- Encinitas, CA, USA

problem #10

Feb 062014

A4 4-cyl

  • 50,000 miles
While driving through a parking lot, my 2004 Audi A4 1.8 cabriolet suddenly accelerated for no apparent reason. I was able to shut it down and checked to make sure the floor mat was not interfering with the gas pedal. I restarted the car and drove to my next location without incident. However, after leaving my next location and pulling out onto the main road the car started accelerating again and was difficult to control. The more I applied the brake, the more the engine raced. Afraid of causing an accident in rush hour traffic, I was able to pull into a parking lot and turn off the car. This also happened to me about a year ago, but I assumed it was the car mat because it never happened again until February of this year. After being made aware of the Toyota problem, I decided to research a bit and have discovered mine is not an isolated Audi problem. I'm honestly afraid to drive the car out of concern this may happen again.

- Bloomfield, CT, USA

problem #9

Oct 282013


  • 41,000 miles
I was driving my 2004 Audi A4 (1.8, convertible) on a local road at approx 30mph, when the accelerator suddenly dropped from under my foot and the car accelerated very rapidly. It felt like the cruise control had come on by itself (the cruise control was completely off at the time). I put the car in neutral and pulled over. When I shut the car off, the gas pedal popped up and felt normal. When I turned the car back on several times, it continued to immediately accelerate all the way with the gas pedal dropping to the floor. The car is now being towed to a mechanic. Had I been in a tighter situation at the time, it could've been ugly.

- Rye, NY, USA

problem #8

May 302012

A4 4-cyl

  • 107,233 miles


I was driving our 2004 Audi A4 on a two lane road at approximately 30 mph. Moved into the left hand lane and accelerated to 35 mph to pass a car and when releasing my foot from the gas pedal, the gas pedal continued to depress all the way to the floor on its own and the car accelerated at a high rate of speed. I could not pry the gas pedal from the floor and could only slam on the breaks to slow the car down. The car accelerated for a total of 15-20 seconds. Nothing was physically causing the gas pedal to stick to the floor such as the mat or other obstruction. Was able to avoid a collision with another vehicle. Will no longer drive my car for fear it will happen again. I have two young kids that were in the car at the time. Have read about similar issues with other peoples Audi?S on this site. Something needs to be done to fix this problem before it becomes fatal.

- Warwick, RI, USA

problem #7

Apr 172012

A4 4-cyl

  • 74,000 miles
On three separate occasions over the past 3 years, we have lost control of acceleration in our 2004 A4. I have pressed my accelerator to pass on a highway and the accelerator continues to go down increasing speed of car against my will....on first two occasions I was able to pump breaks and kick gas pedal for release (and assumed it was a mat issue, however I started to question that issue on the second occasion after inspection of my mat and I also felt like the pedal pressed away from my foot all its own, like on cruise control even thought my cc was not on)....however tonight my husband was driving and the same thing happened accelerating from a red light, since I had experience with this problem I knew to flip it into neutral...however engine continued to rev at high rpms once we got to the side of the road, turned car off and on...still rev'd up. Finally on the second time turning car off and on again we proceeded home and car drove fine. This is the car I drive my children in and I have come across many similar incidence online which is how I found this site...I want to get rid of car but have reservations about selling it to someone else. All incidences online that I come across Audi dealerships does nothing, I plan to take my car in tomorrow as I now know for sure it is not a mat issue. Did we not just deal with this same issue with Toyota.

- Salt Lake City, UT, USA

problem #6

Sep 232011

A4 4-cyl

  • miles
The vehicle according to the Audi dealer has a bad automatic tcm transmission control module that causes the car to slip gears or not shift down when coming slowing down and then needing to accelerate. The vehicle will stay locked in 3rd gear and when pulling out on to the freeway or a busy street it makes it difficult to get up to speed. When parked on a slanted driveway or street the vehicle may not engage a gear once it has been selected and the car will roll down hill.

- Sacramento, CA, USA

problem #5

Nov 042010

A4 4-cyl

  • 52,447 miles


1. on November 4th, I traveled early in the day from pittsburgh to altoona, pa using my cruise control often on the highways and roads. I returned to pittsburgh after work and I picked up my daughter at school around 5 pm. We drove and went to dinner. We drove and attended an event at 7:30 pm. 2. following the college admissions event around 9:00 pm, we drove several miles to our home. As we were leaving downtown pittsburgh, and one mile from our home, the car's accelerator pedal remained down on its own, pushing the car forward. I stood on the brake to stop the car as we came to a stop light. I took my foot off the brake and the accelerator pedal remained in the down position with the car accelerating on its own. I once again stopped the car by standing on the brake. I then tried to lift the pedal physically with my hand and foot, believing that would help. I also tried moving the mat. The car had been inspected two weeks earlier and the mat lock was not put back on. The car was moving on its own. I stopped the car by standing on the brake, put it in park and the engine revved very high and I quickly turned off the engine. This had never happened before in the nearly 2 year history of owning the car. For one mile, the car's accelerator was stuck to the floor of the vehicle. 3. in the morning, I called the dealership that services the car and had conducted the inspection two weeks earlier. I used my aaa service to tow the car into the dealership. The tow truck driver did start the car and the pedal was no longer stuck. The dealership was unable to recreate the event and returned my car in one week stating they had opened a file, contacted the manufacturer, and that I could come and take my car back and drive it. It appeared they drove it 35 miles in that time period. I am driving the car and I have not used my cruise control. I remain concerned for the safety of myself, my family and my community. I am not sure what I should do.

- Pittsburgh, PA, USA

problem #4

Oct 072009


  • 81,920 miles
Driving South on NJ turnpike at approx 65mph. Attempt to pull to left lane and pass, driver presses on gas pedal and the pedal drops completely to floor and car accelerates out of control. Through heavy brake application car is slowed and pulled to shoulder and stopped. Ignition immediately turned to off. After chance to calm down, driver restarts car and gas pedal now operates normally. This situation has occurred 5 times in the 5 years car has been owned to 2 different drivers. Last episode occurred only 3 weeks after previous instance. In all cases, cruise control lever was in on condition but not activated, car was being driven by manual gas operation. This is not the 1980S Audi sudden acceleration at start up. Crash was avoided because passenger is a certified high performance driving instructor and was able to calmly issue instructions. This issue was reported to dealer when car was under warranty but nothing was done. It has been intermittent but increasing in frequency. It is most likely a electrical flaw (wiring?) in the cruise control system. As well as a certified instructor, owner is an electrical engineer. First time it happened October 2006 and car had less than 40500 miles.

- Bowling Green, KY, USA

problem #3

Jun 012007

A4 6-cyl

  • Automatic transmission
  • 30,000 miles
The contact's father owns a 2004 Audi A4. While driving 15 mph, another vehicle crashed into the driver side rear door of the vehicle. Furthermore, there was a sudden acceleration that caused the vehicle to crash into a pole. The air bags failed to deploy. The vehicle was destroyed and a police report was filed. The driver sustained a cracked knee cap and sternum. As of October 5, 2007, the dealer and manufacturer had not inspected the vehicle. The VIN and engine size were unavailable. The current and failure mileages were 30,000.

- Pittsburg, PA, USA

problem #2

Nov 162006

A4 4-cyl

  • Automatic transmission
  • 25,334 miles
: the contact stated while driving 35 mph uphill on a street, upon making a right turn, the vehicle accelerated to 40 mph without warning. The contact applied brake pressure which stopped the acceleration. The vehicle was inspected by a dealer who was unable to duplicate the problem. The manufacturer was alerted.

- Old Town, ME, USA

problem #1

Jun 022004

A4 4-cyl

  • Automatic transmission
  • miles
Vehicle lurched or accelerated upon final parking near a stop with foot off accelerator pedal and on brake pedal. Car accelerated for more than half a mile at 80 mph. Consumer was able to control vehicle and put it in neutral. Dealer indicated vehicle operated as designed by the manufacturer, there was nothing wrong with vehicle.

- Saint Petersburg, FL, USA

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