pelletman

OK, Saturday morning, put wheels back on and put the car on the ground, on 3" of wood under each wheel. Car seemed low before I started it, when started, it pumped up to what I would say is a normal height, rear is back up but I don't know why! I made sure all tires had same pressure to make things more accurate. It seems that the rear is back after cycling a couple times between dynamic and comfort. The left rear seems to be about .25" higher than the rest of the car. One thing suspicious is the pressure went up to only 8 bar or so. I am suspecting the compressor is weak and I might go ahead and rering it to make sure it is good. I don't like that low pressure as the compressor would work harder than it has to. I have no idea what i did to fix the rear suspension but it seems to be holding. I am not going to put it in lift and then jack mode and let it sit overnight and take readings and measurements tomorrow. If nothing sags I think I will redo the compressor and put it back together. I'd appreciate your input on the latest info I have posted. Thanks!

Group 34 readings below:


Address 34: Level Control (4E0 910 553 H)

09:25:54 Group 003
High level selected
[N/A]
Lower level selected
Relay OFF Compressor Status

09:25:54 Group 004: Deviation from standard level
-20.0 mm Front Left
-20.0 mm Front Right
-20.0 mm Rear Left
-22.0 mm Rear Right

09:25:54 Group 006
21.0°C Compressor temperature
8.46 bar Pressure sensor signal
OFF Drain valve Status
OFF Pressure accu. valve

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Address 34: Level Control (4E0 910 553 H)

09:29:35 Group 003
High level selected
[N/A]
Lower level selected
Relay OFF Compressor Status

09:29:35 Group 004: Deviation from standard level
23.0 mm Front Left
23.0 mm Front Right
27.0 mm Rear Left
24.0 mm Rear Right

09:29:35 Group 006
52.0°C Compressor temperature
2.28 bar Pressure sensor signal
OFF Drain valve Status
OFF Pressure accu. valve

pelletman

Anyone have any input on reringing the pump to take care of the low pressure situation? Or should I be looking at something else?

Giovanni Giovino 6.0+6.0TT

I am not sure what to say, but I would think you do not have a compressor problem, as it built pressures of 15.95 and 16.28 bar as shown in your scan, if all is sitting good and level with no dropage of any corner overnight, I would drive it around for some time and re-visit the issue with a fresh scan, and try to get the pressure reading in fields with the relay on, your last shows relay off and the low pressure, you may have no problem at all, I know the one time I put my A8L on the lift without using "jacking mode" all four corners fell to the ground and I could not even move the lift arms, I had to lift the lift a few inches then cycle to start stop engine a few times and all was good, has been for years, and yes I was in lift mode, but not jack mode, so I understand your frustration as I was also confused as to why mine would not "Lift" when in lift mode after lowering shop lift.....

My 05 A8L W12 is on all original struts, level sensors, and compressor, closing in on 200K

JJJ

pelletman

I had the car in lift mode and jack mode since Saturday, took new measurements tonight. Here is how they compare

Saturday Tuesday (tonight)

LR 33.125 33.125
LF 33.25 32.75
RR 32.75 32
RF 32.875 32.5

I guess that's OK? If that is the consensus I guess I will put the inner fender liners back on and drive it again.

pelletman

OK, I got the wheels back on and drove the car, no suspension lights and things seem to be holding up well. I will VCDS scan later to see what the pressures are I'm not sure what was causing my issue at this point. Thanks everyone for the help!

ltooz_a6_a8_q7

After the jacking up, the system needs sometimes to sense and control everything back to the optimum state... That's how a control system works, a good one at that, trust Audi's systems, they're quite well designed regardless of what people say.
Cheers,
Louis

pelletman

Still getting occasional yellow and green lights. Suspension seems ok though.

Jack88

Yellow light points to some issue still being present, unfortunately. If the issue was a leak, I'd think you would see more drop with it parked if it was bad enough to trip lights while driving, but not necessarily.

pelletman

Thank you Jack. I haven't rescanned lately but I am gonna guess lower limit exceeded. Any advice on what I should look at first?

pelletman

Yellow light on solid, in dynamic and the others are grayed out, but i think that will change when I restart the car. These are the codes that are coming up today. Car is at the right height I believe

Thursday,17,January,2019,15:15:56:24716
VCDS Version: Release 18.9.0 (x64) Running on Windows 10 x64
Ross-Tech: Home

Address 34: Level Control Labels: 4E0-910-553.clb
Control Module Part Number: 4E0 910 553 H HW: 4E0 907 553 F
Component and/or Version: LUFTFDR.-CDC H06 4480
Software Coding: 0019911
Work Shop Code: WSC 11111 111 45799
VCID: 2809043BDEF51387F6B-807C
2 Faults Found:

01772 - Signal from Level Control Pressure Sensor (G291)
008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 3
Fault Frequency: 15
Reset counter: 132
Mileage: 259967 km
Time Indication: 0
Date: 2019.01.12
Time: 09:52:57

01400 - Suspension Level Control
002 - Lower Limit Exceeded
Freeze Frame:
Fault Status: 11100010
Fault Priority: 2
Fault Frequency: 6
Reset counter: 92
Mileage: 259987 km
Time Indication: 0
Date: 2019.01.12
Time: 15:23:01

Cleared the codes, yellow light came back on and I haven't moved the car, this code came back

Yellow light on solid, in dynamic and the others are grayed out, but i think that will change when I restart the car. These are the codes that are coming up today. Car is at the right height I believe

Thursday,17,January,2019,15:15:56:24716
VCDS Version: Release 18.9.0 (x64) Running on Windows 10 x64
Ross-Tech: Home

Address 34: Level Control Labels: 4E0-910-553.clb
Control Module Part Number: 4E0 910 553 H HW: 4E0 907 553 F
Component and/or Version: LUFTFDR.-CDC H06 4480
Software Coding: 0019911
Work Shop Code: WSC 11111 111 45799
VCID: 2809043BDEF51387F6B-807C
2 Faults Found:

01772 - Signal from Level Control Pressure Sensor (G291)
008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 3
Fault Frequency: 15
Reset counter: 132
Mileage: 259967 km
Time Indication: 0
Date: 2019.01.12
Time: 09:52:57

01400 - Suspension Level Control
002 - Lower Limit Exceeded
Freeze Frame:
Fault Status: 11100010
Fault Priority: 2
Fault Frequency: 6
Reset counter: 92
Mileage: 259987 km
Time Indication: 0
Date: 2019.01.12
Time: 15:23:01