I've been member on here for a while somehow i couldn't access my log in had to make another one. Silver D2 hope you can chime in as you are very knowledgeable along with many others. So about 2 weeks ago my MMI screen started acting up where i couldn't get pass the warning screen (assuming maybe the big button inst working maybe as I've press it with no response).

Last week i notice in the morning the front of the car is lowered. I proceed to start the car and it raised up which shows that the compressor is working. While driving sometimes the green light would come on and off and sometimes both the orange and green lights are on. It happens sporadically where it would lower while the car is park and raise back up while driving. there are also times when it would stay at the proper level.


I have changed the relay, the 40 amp fuse is fine. Here are the codes using Vag. The compressor is working and kicking on at all times so i can rule that out.

any help is greatly appreciated i have also read many of the other post just trying to get some more ideas.


VCDS Version: Release 12.12.2 (x64)

Address 34: Level Control Labels: 4E0-910-553.lbl
Control Module Part Number: 4E0 910 553 H HW: 4E0 907 553 F
Component and/or Version: LUFTFDR.-CDC H06 4480
Software Coding: 0015510
Work Shop Code: WSC 02313 785 00200
VCID: 285445D19B95AE5EF37-807D
8 Faults Found:

01577 - Turn-Off due to Over-Temp
001 - Upper Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100001
Fault Priority: 4
Fault Frequency: 1
Reset counter: 99
Mileage: 340411 km
Time Indication: 0
Date: 2014.07.23
Time: 22:37:48

01400 - Suspension Level Control
002 - Lower Limit Exceeded - Intermittent
Freeze Frame:
Fault Status: 00100010
Fault Priority: 2
Fault Frequency: 35
Reset counter: 99
Mileage: 338456 km
Time Indication: 0
Date: 2014.07.10
Time: 07:10:31

00776 - Level Control System Sensor; Left Front (G78)
008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00101000
Fault Priority: 3
Fault Frequency: 4
Reset counter: 99
Mileage: 340316 km
Time Indication: 0
Date: 2014.07.23
Time: 11:21:28

01299 - Diagnostic Interface for Data Bus (J533)
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 73
Mileage: 0 km
Time Indication: 0

01583 - Leak in System Detected
000 - -
Freeze Frame:
Fault Status: 11100000
Fault Priority: 3
Fault Frequency: 45
Reset counter: 59
Mileage: 338558 km
Time Indication: 0
Date: 2014.07.10
Time: 09:58:34

01399 - Relay for Level-Control Compressor (J403)
009 - Open or Short to Ground - Intermittent
Freeze Frame:
Fault Status: 00101001
Fault Priority: 2
Fault Frequency: 4
Reset counter: 61
Mileage: 338559 km
Time Indication: 0
Date: 2014.07.11
Time: 03:27:44

00456 - Control Module for Access and Start Control (J518)
004 - No Signal/Communication - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 73
Mileage: 0 km
Time Indication: 0

01299 - Diagnostic Interface for Data Bus (J533)
008 - Implausible Signal - Intermittent
Freeze Frame:
Fault Status: 00100100
Fault Priority: 3
Fault Frequency: 1
Reset counter: 73
Mileage: 0 km
Time Indication: 0

 

There is an air leak in the suspension system.
First thing to do is isolate and repair it.
Could be in the air lines or one or more of the air shocks.

I would also check wiring for G78 and/or replace it to eliminate that DTC.
The compressor is running to the point it's overheating and shutting down.
This will eventually lead to a burned up relay and dead compressor motor.

If one corner is lower than the other after sitting over night, suspect that is where a leak is.
Good old soap and water test is the easiest assuming you don't hear the leak.

 

ill be looking for leaks im hoping if it is leaking i can see it without taking off the suspension. I have changed the relay so thats not a prob ill scan again to see if that code went away. Do you think the G78 level control sensor could cause it to be sitting low?

 

G78 could be causing problems, but I think it's a bigger issue than just the sensor.

 

Update: did the soapy water test at the top of the valve and driver aide front one is leaking

 

Not sure if you mean the valve block or the valve on the shock itself.
If block, then try sealing it or replace.

As for the air shock this is your best bet: https://www.arnottindustries.com/par...17_pid174.html

 

I remove both rubber boot off the top of the shock m pour the soapy water there and nothing but bubbles so I'm not sure..
Ideas ?

 

[QUOTE=jakematic;1477289]Not sure if you mean the valve block or the valve on the shock itself.
If block, then try sealing it or replace.

As for the air shock this is your best bet: https://www.arnottindustries.com/par...17_pid174.html[/QUOTE
Pic attached

 

Uhhhhh, yeah.... that's likely a new air shock
Check the connection just to be on the safe side though.

Some folks claim you can put some 'slime' (?) in there that's similar to Fix-A-Flat.
Don't do that please, it will just make things worse eventually.

 

not sure how big the leak is, when put the soapy water in today i had to kinda move the hose for a lil before it bubbled up.