Hi,

Just signed up in this forum, because I'm not able to find a solution for this.
I've read hundreds of posts regarding this issue, but after a while, there are so many different causes for this problem, that I got lost on the way to find the right solution.

I own a 1999 Audi A6 Avant, 4.2L, and approx 2 years ago, I got for the first time the ABS+ESP+Big red brake light on, all at the same time, follow by 3 beeps.

This has happenen with the car cold, warm, running at 50km/h, running at 230Km/h, comes and go. The first time this happened I changed the ABS ECU unit, the MAF, but it didn't solved the problem. I never understood why, but after a while the same way the problem came, also went, and the car has been running for the last 2 years with out any problem.

Unfortunately the problem returned, and I want to understand what might be wrong this time.

When I connect the VCDS, I get these fault codes:

Chassis Type: 4B - Audi A6 C5
Scan: 01,02,03,06,08,15,16,17,18,22,34,35,36,37,45,55,56 ,57,65,67,75,76,77

-------------------------------------------------------------------------------
Address 01: Engine Labels: None
Controller: 4D0 907 558 A
Component: 4.2L V8/5V G 0002
Coding: 05752
Shop #: WSC 02325
VCID: 2B2984AFCA1D
1 Fault Found:
16487 - Mass Air Flow Sensor (G70): Signal too High
P0103 - 35-10 - - - Intermittent
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 02: Auto Trans Labels: 01V-927-156.LBL
Controller: 4B0 927 156 BA
Component: AG5 01L 4.2l5V RdW 1214
Coding: 00001
Shop #: WSC 02325
VCID: 67A1389F1675
1 Fault Found:
18265 - Load Signal: Error Message from ECU
P1857 - 35-10 - - - Intermittent

-------------------------------------------------------------------------------
Address 03: ABS Brakes Labels: 8D0-907-389.LBL
Controller: 8D0 907 389 A
Component: ABS/ESP allrad D05
Coding: 06397
Shop #: WSC 02325
VCID: 311596C7E831
1 Fault Found:
18265 - Load Signal: Error Message from ECU
P1857 - 35-10 - - - Intermittent

Based on this input, could someone give me a hint on possible solutions?

Thank a lot for the help.

 

Have you checked the brake fluid level? When I first bought my car I had the exact same issue - 3 loud beeps with flashing brake light, etc.
Turns out it was the brake fluid being low. In your case if it is more constant and you have fluid- make sure it's clean and has no debris and can reach its destination. Or maybe the sensor that detects the fluid is bad?

 

I'll check that tonight, thanks!

 

You might get a chuckle out of this, but it is a known little issue

If at some point you've replaced your brake fluid reservoir, or flushed and refilled, there is that little bobber in it that needs to float. Well in mine it got stuck down and lit up the lights that you've listed like a christmas tree. Unscrewed the lid and wiggled the bobber around till it floated properly, never had a flash since.

 

I'll also check that together with the brake fluid level.
In the mean time i got the license of the VCDS yesterday evening, so I'll be able to run a more deep analysis on the faults. Right now the plan is to clean all the faults the car has in memory and start from there.

I've also ordered a brake switch to replace the one on the car, because looks like this can also cause the issue I've described above.

I'll keep the post updated.

If someone else has any other ideas, please I appreciate the help.

Thanks guys

 

Just an update on this topic.

As suggested:

• I've changed the brake switch and nothing changed.
• Checked the break fluid reservoir and replaced the brake fluid, and nothing changed.

Done based on Audi feedback:

• Replaced the ABS module and nothing changed.
• Replaced the Mass air flow sensor and nothing changed.

Done based on a suggestion given by mechanic:

• Remove the Intake manifold module, clean it and reinstall it, and guess what: problem solved.

Hope this can help other members experience the same problem.

 

Glad to hear it was a simple fix!

 

hi are you able to add some pic which part exacly you talking about this controler or maybe add link to youtube how to do this

 

Where is that intake manifold module and what does it look like.
I have the same dash lights you had and had master cylinder replaced but ABS and Brake light are both still o.
Thank you
Kurt