This all started happening after I got my car out of the shop to get my brake pads replaced and oil changed. I was driving and there was this unusually large dip in the road around where I live that I had no idea of. After that happened, my fuel gauge and speedometer went nuts. The fuel gauge fluctuated every time I pressed on the gas and the speedometer just stopped working altogether.

Thankfully, everything returned to normal....almost.

The fuel gauge works totally fine. However, from time to time, the speedometer does not work, and it takes a few minutes of driving for it to actually start working....

I'm guessing there's a loose sensor somewhere after that dip, any ideas?

 

anyone?

 

I have a very similar problem with my A4. The speedometer started working intermitently and now it doesn't work at all. I ordered a new speedometer sensor, but I can't see how I am going to get to it. It is supposed to be on the differential. I may have to rip the whole car apart to replace a $20 part. How is your problem turning out. I would like to know what you ended up doing. If anyone out there has any experience on this it would be a great share.

Thanks.

 

Sorry in advance for the dual post with another thread, but I wanted it to be here for people that are in my position in the future:

I got the new Speed Sensor installed today. I have a US spec 2.8L V6 2WD. On my car, the sensor is located on the driver's side of the differential at the very bottom of the car. It can only be reached easily by taking off the drivers side front tire and reaching through the hole around the axle. There is a metal plate that surrounds the axle and makes access a real challenge. The swap out took some time as I had to find that way to get to the part. Once I figured that out, it came in and out pretty easily. First pull out the retaining clip for the wiring harness and remove harness. Then push down on the tab to release the holds and turn the sensor towards you about 1/4 turn, then pull it out. Put in the new one at the same angle and turn away from you back into the hold. Reapply the wiring harness and then the hardest part: the retaining clip for the wiring harness was a royal pain to reapply as you have almost no room to work and you cant see what you are doing. Total time for me was around 1 hour once I decided to take off the wheel. I could probably do it much faster now, but if you leave yourself two hours you should be fine. Good luck to anybody that needs to get the speedometer sensor replaced. I hope that this post helps. It fixed my problem for less than $30!