ABS
AudiWorld Senior Member
Joined: Mar 2002
Posts: 1,926
Likes: 21
From: Michigan
Ditto, yes... Also your MPG computer will not work in the static mode
Your doors will not lock at 5MP (if you had that setting on)
Your steering may feel weird at highway speeds
You may also have the electronic parking brake warning (very annoying with beep)
the symptoms may be intermittent but everything is fine when startring cold but lights, speedometer fail happens after first few miles driving.
Does this describe your situation?
Your doors will not lock at 5MP (if you had that setting on)
Your steering may feel weird at highway speeds
You may also have the electronic parking brake warning (very annoying with beep)
the symptoms may be intermittent but everything is fine when startring cold but lights, speedometer fail happens after first few miles driving.
Does this describe your situation?
AudiWorld Senior Member
Joined: Mar 2002
Posts: 1,926
Likes: 21
From: Michigan
Steering hard is pretty much what I meant by "weird". In my case it was too hard at slow speeds and too loose at highway speeds.
"Parking brake malfunction is what i meant by "warning" My "malfunction" warning also beeped once the car was over 5mph. It would stop beeping after driving for a while, then beep again, if i stopped and started out again.
All of these symptoms mentioned, including ABS and ESP (electronic stability program, which is also called traction control) are related to the speed of your vehicle. In the left front wheel hub is a speed sensor. (all wheels have a speed sensor). This is how the ABS determines if one wheel is slipping when braking)
The electronic parking brake also needs to know the cars speed because the control module under normal conditions needs to negate applying the brakes if you are over 5MPH. Without the speed signal, the control module doesn't know what to do so it signals the "malfunction" and won't allow the electronic brakes to be applied.
The speedometer definitely needs to know the speed which is obvious.
Power steering is speed sensitive. It gives you more "power" at very slow speeds and less at highway speed. Without the speed signal, it gets confused.
Static MPG computer read out, needs to know speed. If you switched to this "static' mode, I'm betting it doesn't work. Average MPG is a function of the miles driven, not speed so it probably works.
An option on the SETUP is to lock doors when you reach 5MP. (You may or may not have this enabled). Without the speed signal, it doesn't work.
Even the air deflector at the front of your moon roof needs speed to adjust the deflector for wind noise.
So it all points to the speed sensor. If you do a scan, it will probably show a P0501 fault in the left front wheel.
It could be something as simple as a dirty sensor which is mounted on the wheel bearing housing. It's a magnet type thing that creates electronic pulses from notches on a ring that spins with the bearing. Cleaning it might do the trick.
However, it could also be the wire inside a bundle that does to the ABS module. These wires get old and brittle but that wasn't my problem which was intermittent and affected by heat. When it was cold, everything worked. After the engine compartment warmed up (4-5 minutes of driving), it wold fail. The car still runs but warnings are annoying, the steering "weirdness" requires you be more careful and without a speedometer, you have to use your tachometer and gauge your speed.
If this is your situation, it points to a common problem on Audis of any car that uses the Bosch ABS module. The module is mounted on the side of the modulator pump. It is he "brains" that tell your ABS to stutter if you are sliding on ice, etc.
Replacing this module with new costs about $400, plus labor. You can take the module off (it's a tight place to work) and send it to a repair place for about $125. I did mine on my 05 A8 last March and haven't had a problem since. It is possible to take the module off without disconnecting brake lines (which would need to be bled on reassembly). you can even drive the car while waiting for return of the repaired module. Naturally all the lights and beepy beeps would continue. If your electronic parking brake malfunction is accompanied by a beep, pull the two 30 AMP fuses in the fuse panel in the trunk. (they are the last two at the bottom of the row.). Elect parking brakes can't work without the fuses but with the malfunction, they aren't working anyhow.
"Parking brake malfunction is what i meant by "warning" My "malfunction" warning also beeped once the car was over 5mph. It would stop beeping after driving for a while, then beep again, if i stopped and started out again.
All of these symptoms mentioned, including ABS and ESP (electronic stability program, which is also called traction control) are related to the speed of your vehicle. In the left front wheel hub is a speed sensor. (all wheels have a speed sensor). This is how the ABS determines if one wheel is slipping when braking)
The electronic parking brake also needs to know the cars speed because the control module under normal conditions needs to negate applying the brakes if you are over 5MPH. Without the speed signal, the control module doesn't know what to do so it signals the "malfunction" and won't allow the electronic brakes to be applied.
The speedometer definitely needs to know the speed which is obvious.
Power steering is speed sensitive. It gives you more "power" at very slow speeds and less at highway speed. Without the speed signal, it gets confused.
Static MPG computer read out, needs to know speed. If you switched to this "static' mode, I'm betting it doesn't work. Average MPG is a function of the miles driven, not speed so it probably works.
An option on the SETUP is to lock doors when you reach 5MP. (You may or may not have this enabled). Without the speed signal, it doesn't work.
Even the air deflector at the front of your moon roof needs speed to adjust the deflector for wind noise.
So it all points to the speed sensor. If you do a scan, it will probably show a P0501 fault in the left front wheel.
It could be something as simple as a dirty sensor which is mounted on the wheel bearing housing. It's a magnet type thing that creates electronic pulses from notches on a ring that spins with the bearing. Cleaning it might do the trick.
However, it could also be the wire inside a bundle that does to the ABS module. These wires get old and brittle but that wasn't my problem which was intermittent and affected by heat. When it was cold, everything worked. After the engine compartment warmed up (4-5 minutes of driving), it wold fail. The car still runs but warnings are annoying, the steering "weirdness" requires you be more careful and without a speedometer, you have to use your tachometer and gauge your speed.
If this is your situation, it points to a common problem on Audis of any car that uses the Bosch ABS module. The module is mounted on the side of the modulator pump. It is he "brains" that tell your ABS to stutter if you are sliding on ice, etc.
Replacing this module with new costs about $400, plus labor. You can take the module off (it's a tight place to work) and send it to a repair place for about $125. I did mine on my 05 A8 last March and haven't had a problem since. It is possible to take the module off without disconnecting brake lines (which would need to be bled on reassembly). you can even drive the car while waiting for return of the repaired module. Naturally all the lights and beepy beeps would continue. If your electronic parking brake malfunction is accompanied by a beep, pull the two 30 AMP fuses in the fuse panel in the trunk. (they are the last two at the bottom of the row.). Elect parking brakes can't work without the fuses but with the malfunction, they aren't working anyhow.
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Joined: Jan 2006
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From: Las Vegas, Nevada USA
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