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  #1  
Old 05-16-2009, 01:24 PM
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Default Slow Accleration/Brake Light Switch

2002 A6 4.2 Quattro

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.

rj
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Last edited by rjlavender; 05-16-2009 at 01:27 PM.
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Old 05-16-2009, 06:52 PM
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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.
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Old 05-18-2009, 12:29 PM
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I am th eone who posted a while back...
I paid $4 for the switch and it is a5 min DIY
PITA to ahve a $5 issue on a $40+k car
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  #4  
Old 05-23-2009, 12:36 AM
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Would this cause the brake and abs like to stay on.... mine will turn on then after a bit of driving ill fill something in the petal and it will kick off then might kick back on...
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Old 05-27-2009, 12:03 AM
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grrr, i got brake light switch code.

I took it apart and cleaned, but still not work. When brake pedal is depress, switch has to be pushed all the way in ???
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Old 05-27-2009, 05:36 PM
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well, i find out, there is two switches. One called Cruise control switch and second one Brake light switch.

Looks like, if you have a problem with cruise control, you should replace that first one .
am i right ?
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  #7  
Old 05-28-2009, 12:20 PM
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Quote:
Originally Posted by formulagigi View Post
I am th eone who posted a while back...
I paid $4 for the switch and it is a5 min DIY
PITA to ahve a $5 issue on a $40+k car
it's better to have a $5 issue on a $40K car than a $40K issue on a $5 car!
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Old 05-29-2009, 06:01 PM
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Quote:
Originally Posted by NH_USA View Post
it's better to have a $5 issue on a $40K car than a $40K issue on a $5 car!
I'd get rid of the $5 car but i doubt you'd ahve a 40k issue on it

My 99Jeep has been far more reliable than my 04 Audi
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  #9  
Old 05-14-2010, 02:31 PM
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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.
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  #10  
Old 07-10-2010, 02:26 AM
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$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.

Last edited by mikeross; 08-05-2010 at 02:15 AM.
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  #11  
Old 07-10-2010, 03:44 AM
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Hello im looking for a few Parts for 1999 A6 2.8 i dont know if you are able to help me or not but here is what i need. ABS Module part number is 8E0998375 transmission Module part number is 4B0927156CE throttle body Module 078133063AM and ECM part number is 4D0997JJ1EX if you know where i could find these parts in case you dont have them please let me know thank you very much!!!
its boging out and doesnt drive properly what do i do??? engine light is on ABS light is on and Ebrake light is blinking. i got the codes too SOME ONE PLEASE HELP!!!
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  #12  
Old 07-11-2010, 02:52 PM
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Call Force Five in Concord NH
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  #13  
Old 07-11-2010, 04:47 PM
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Yeah I called a few dealers around town and looked up how to fix it. It turned out to be a five dollar part and the parts manager came out on showed me how to fix the brake light switch. It was about a 30 second job. Thanks for everyone's help.
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  #14  
Old 08-05-2010, 02:18 AM
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Good for you kreed.. Lucky you found a nice parts manager to help you with it. I remember back then I had trouble replacing the stop light switch of my car too but it cost me much because I did not know how to install it myself.

Last edited by mikeross; 08-09-2010 at 10:11 PM.
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  #15  
Old 09-02-2011, 11:28 PM
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Default 2003 Audi A6 brake light switch

I had sluggish acceleration, my cruise control would work sporadically, ABS and traction control lights were on almost constantly. Then my brake lights all went out simultaneously. I thought it might be a fuse and called the local Audi dealer to see if it was an easy fix. He told me it was probably the brake light switch. I got on this forum and found others having very similar problems (specifically rjlavender from a 5/2009 post...thanks rjlavender).

Also found great step-by-step instructions on how to replace the brake light switch here:

http://forums.audiworld.com/showthread.php?t=1940445

I bought the part at my local Audi dealer for $15.95 and replaced it myself per the instructions above. The hardest part was removing and replacing the panel cover underneath. Approximate time for a non-mechanical guy who knows nothing about cars to replace, 1 hour 15 minutes.
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03, 2004, a6, audi, brake, car, connected, control, cruise, light, located, problem, replacement, replacing, switch, transmission, tt


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