jlbell

What was the temperature change over 12 hours? Lastly, was the car left in jack mode?

d6lc

Car remains in Jack mode, temp in garage may have dropped from 65 to round 55. The temp drop of the actual car may well have been a little more as I drove it 15 miles in 70F just before parking it and taking the initial measurements.
I will do it again when I get home, which would have been more stable from a temp standpoint over the past 12 hrs, and 24hrs since the first measurements

d6lc

24 hrs in Suspension drop:
Front left -24mm
Front right -20mm
Rear left -8mm
Rear right -4mm

No change in the channel pressures.

ltooz_a6_a8_q7

The whole system with for struts leak? What are the chances? It must be your valve block, and you said you fixed the valve block? or check for leaks already?
The valve block has non-return air valve and a relief air valve - can the air leak there?
I would check the valve block thoroughly for leaks.
After you drove, then get out of the car, lock the door, do you hear the release of the air at all? You should if the system is GOOD.
Hope you didn't screw up the electronic with the VCDS, even if you did, replace the controller, it will correct itself.
Cheers,
Louis

d6lc

I haven't replaced the valve block, I have Audi work receipts that show it was replaced last year, but the parts were supplied by the previous owner.

I have checked the valve block and it has no markings on it, brand name or part #. So I don't know of its origin, it clearly doesn't look like an Audi part. I also cant tell whether it was a new part. I have sprayed the block and all connections with soapy water and there are no visible leaks. When I get out of the car after a drive, I cant hear any release of air or air leaks.

I had this issue before I has the problem with adaption last week, honestly I think that is resolved and it inst electrical/control related

jlbell

Was this measured by you or pulled from the measurement block using VCDS?

dvs_dave

What is the actual fault description you’re getting? What does it say is wrong with sensor G291?

d6lc

measured by me on the car

d6lc

So last night I stared the car again allowed it to pump up in lift mode, then put it in jack mode again. And disconnected the front sway bar to ensure the front measurements were independent of each other. One thing to note is that even with the 20+mm drop on both front struts the accumulator raised the car most of the way then the compressor only came on for around 5 seconds to get the car fully raised. Even left idling in lift it only needed the one compressor run to raise the car and refill the accumulator. So my expectation is the the pump is strong (again it was listed as being replaced last year by the previous owner on an Audi receipt, but it was a customer supplied unit, visually looks new).

So 12hrs after being in Jack mode and sways disconnected, I get the following
Front left. - 7mm drop
Front right. - 49mm drop
Rear left. - 21mm raise (clearly same principle as a short leg on a table, FR right dropped so much the rear left raised)
Rear right - 5mm drop

With the above data it would seem with the sway connected the right front drop pulled the left down. Feels like my right front strut is the issue, sprayed with soapy water and cannot see any leaks from the wheel vantage point.

d6lc

1 Fault Found:
01772 - Signal from Level Control Pressure Sensor (G291)
008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 3
Fault Frequency: 8
Reset counter: 97
Mileage: 156186 km
Time Indication: 0
Date: 2017.09.27
Time: 08:42:40