I recently had a problem where the car would not accelerate properly. At first, it was intermittent but it got worse.The problem turned out to be the brake light switch (someone on some forum had briefly mentioned this possiblity a couple of years ago, and that is why I looked into it. Thank you, sir!). This is the switch that the brake pedal pushes when you depress the brakes.
The system was throwing three codes. Unbelievably, the brake light switch is connected to the transmission somehow. When there is a problem with the switch, the trans goes into a sluggish mode (I think they used to call it limp mode, if I have my terminology correct).
I bought a new switch at the local foreign parts store. Our independent Audi mechanic installed it and the problem and all of the codes were instantly cleared up. I think I paid around $100.00 for the whole thing.
I am posting this because the mechanic said that this was a very common problem but I have not seen much recently on this or any other forum about it.
Last edited by rjlavender; 05-16-2009 at 02:27 PM.
Yeah its a pretty common problem. I had the same issue a few months back, caused my cruise control to not work, my brake lights to stay on when the car was off, and trying to keep a constant speed was near impossible. I bought the switch did it myself, which wasn't too bad. Fixed all my problem immediately. Glad you got everything cleared up and thanks for the info.
This is what my car is doing now. Do you know if you could do it your self? The only Audi place I can find is the dealer and they want to charge $200.00. I looked up the part and it was fairly cheap. Thanks for posting! My car is doing exactly this.
$200?? That's too much. The replacement for the brake light switch should be less than a 50 bucks. This isn't a high tech job so doubt if very much probably around 25 - 30 dollars to have someone do it for you.