Last post on May 13, 2013 at 11:21 AM
You are in the Audi A6
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Audi A6, Sedan, Wagon
#1348 of 1402 02 a6 2.7t ABS issues and sounds
Sep 06, 2011 (3:44 pm)
ok, so i have a 2002 audi a6 2.7t...awesome looking car but has troubles. i found out 1,000 later that the bushings were bad on the whole front end. so, got all new arms and everything. it straightened the front tires back out to the normal position, but i am dealing with this next issue. Whenever i make sharp right hand turns (only right hand), there is a noise that sounds like something is grabbing. i had this problem before i replaced the whole front end control arms. so i got underneath the front end and noticed that two arms were rubbing against each other. clearly visible, i even went as far to color the scratched area and then check it later to see if it was scratched, and it was. so, i thought that was the problem, because of the bad bushings and how it kicked the tires out. the more i researched the problem and noise by means of online and going o mechanic shops around here, im finding out that it has something to do with the ABS electronic system or something. when you go o make right hand sharp turn, the car jerks and goes, then jerks and goes until you straighten it out, then it goes back to normal. like i said, this happens only when i make right hand turns. its loud, annoying, and im totally lost as to what the diagnosis is for this. the place who can look at it cant do so until next friday. the dude at the place who looked at it today said its something electronic. he had the vehicle computer hooked up to his diagnosis tool and cleared the code(s) but it still came on. i know the black rod behind the driver wheel has or might have something to do with it. can anyone help please? im lost, stressed, broke but still love the car and feel its worth it to fix.
#1349 of 1402 Re: 02 a6 2.7t ABS issues and sounds [jhamilton32]
Sep 07, 2011 (1:38 am)
You did the correct thing in replacing the front ball joints & other needed parts as this is a reoccurring problem. Hope you had an alignment done as well.
Three things you need to do;
Brake pads and rotors front
Wheel alignment front
Power Steering system
Jack up the front end of the car, remove both front tires and with a flash light compare the brake pads on the left side with the right side.If the right side has more wear (less pad thickness) or the rotor show signs of
unusual wear, groves, scratches.
Second point check the power steering system; I will have to research this and get back to you. if it is electronically controlled steering this could also be a problem. Electronically controlled Power steering controls two function; resistance based on the speed of the car;I.e.,The faster you drive the more resistance, the slower you drive the easier the steering becomes.
Check the Power steering fluid level, top it of with the Audi recommended fluid type, that's in your manual if you have one.
Finally if your A6 is Quattro (All wheel drive (AWD)) this could be a mechanical problem, but will take the easier stuff first.
The ABS issue is Brake related but other than unusual brake wear you most likely will not see the problem because it's electronically controlled by sensors on each wheel and a central control unit called an ECU. What you need for this is the error code that your shop guy cleared with that diagnostic device.
If you have a power steering pump, check the belt that drives it and the tensioner for that belt, if the belt is loose or the tensioner is not turning smoothly the steering may be binding.
I will get back to you as soon as I find the information that might help.
Keep in mind that your car was not designed for "Do it yourself Mechanics".
the extent of what you can do on your car is directly related to having the correct devices to diagnose the problem, and one of those things is $$$$$$$.
If this is a brake problem, (ABS) you should leave this to a professional shop or Audi Dealer as it's a safety issue. The purpose of the information I'm passing on to provide you enough knowledge that should you go to a repair shop you can converse and hopefully understand that what they are telling is correct or not.
JKAudiA6 PS the Black Wheel behind the driver wheel?????????
#1350 of 1402 Re: 02 a6 2.7t ABS issues and sounds [jkaudia6]
by Mr_Shiftright HOST
Sep 07, 2011 (9:38 am)
This also sounds like a possible issue with the AWD.
#1351 of 1402 Re: 02 a6 2.7t ABS issues and sounds [jkaudia6]
Sep 07, 2011 (10:44 am)
Back again jhamilton32 !
Well no luck finding a document for the suspension but while reading I forgot the ESP system. ESP is an electronic traction control which regulates vehicle handling through the braking system. ESP and ABS are controlled by the same ECU unit along with engine management. In critical circumstances these systems work together to keep the vehicle on the road: Wheel spin, Aquaplaning in wet weather, or tight turns where the rear end might brake loose.
If you have Dashboard warning lights for either of these systems this would be another place to look. As a follow up those to tie rods that are or were touching should not be. Check to make sure that one or the other is not bent. If you are the second owner and the vehicle is high mileage perhaps the first owner neglected to inform you that one of those tie rods was replaced in the past.
Here is a TSB
http://uberlame.com/a6_tsb/Electrical/ESP%20light%20on%20(DTC%20Please%20read%20engine%20control%20unit).pdf for a more recent Technical Service Bulletin (TSB) on ESP ABS.
I hope this has been of some help. ESP and ABS are dynamic systems and as a result
rather complicated to trouble shoot without a CAN BUS II device.
Best of Luck
Oct 25, 2011 (1:27 pm)
I loved my B5 S4 so much that I ended up buying another 2.7TT in an C5 A6 trim. I love these cars, yes they leak from every seal, yes they blow torque converters in Autos and occasionally chew threw sleeves/synchros in Manuals and the electrical issues may become a nightmare without a VAGCOM. My advice to anyone thinking about buying a used 1998-2004 A6/S4 in 2.7TT:
1. Be mechanically inclined there are write-ups for most everything that can go wrong with your 2.7TT with detailed pictures, otherwise be prepared for $$$$$ labor bills from $tealerships.
2. Buy a VAGCOM cable + download the free software
3. Get familiar with the eBay parts - cheap and plentiful for these years of A6
4. Before buying ask yourself - do you really want to have the easy 330HP/350 ft. lbs torque AWD that you will absolutely have to maintain ?
All of this being said - I have done just about everything that can be done between the 2 of my Audis: turbos, trans, torque converter, gaskets, sensors, belts, display cluster, clutch, CAT$$$, etc. But at the end of the day - spooling the 2 x K03's or 2xK04's as you blast onto the onramp at 70MPh without slipping makes it all worth it
#1353 of 1402 Re: 01 A6 2.7L Quatro no start [dochum]
Oct 25, 2011 (1:35 pm)
Check / replace your ICM's (ignition control modules) - 2 little computer modules sitting on the passenger side right above your air filter box. Very common to go out usually dont have to replace more than once in the life of the vehicle. About $60/per
This is what it looks like
#1354 of 1402 Re: Problem with the light in audi A6 [scottyny]
Oct 25, 2011 (1:39 pm)
fog light bulb is out
#1355 of 1402 Re: Problem with the light in audi A6 [trat3gic]
Nov 01, 2011 (1:03 pm)
Greetings scottyny !
If your living in the New York area you don't need fog lights you need a snow plough. All joking aside ! Bulb type should be in your service or owners manual but unless you want to crawl under the front of your vehicle I'd suggest going to the Local Audi dealer or where you have the vehicle serviced.
#1356 of 1402 Re: Followup for vibes while turning [erickpl]
Nov 09, 2011 (8:31 pm)
Please share the TSB if you were able to find it. My 2005 A6 Quattro 4.2L has suffered from the exact same thing since I got it...I had just assumed it was due to the low profile tires since it's an S-Line.
#1357 of 1402 Re: Followup for vibes while turning [starling72]
Nov 10, 2011 (11:22 am)
hello there,...well, i figured it out and had it fixed,. the vibration coming from the left steering wheel..it turns out that my ABS E.C.U (electronic control unit) was bad and had to replaced...found out that the one that was in my car didnt even go to an Audi!! how retarded is that?..the E.C.U. is made up of two parts, the Hydraulic part (which rarely never goes bad) and then the Electronic part of the E.C.U. which is basically a circuit board,..thats the piece that goes bad on these cars...not saying this will totally be your problem, but it really sounds like it...cost wise? mine is a 2002 so it was about 3 something...this is key right here,..Make Sure if this is your problem, that they can get you JUST the circuit board part of the E.C.U...you DONT NEED HE WHOLE E.C.U. REPLACED...Just the circuit board part...you can get by with a " Rebuilt " circuit board, but make sure once its installed that everything else sinks up, because i found out that after fixing my E.C.U, the steering angle sensor was wayyy off and, my Yaw Rate Sensor was bad too...hope this helps