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suspension problem. please help

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Old 01-09-2014, 01:33 PM   #1
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Default suspension problem. please help

Today I noticed that there was a yellow sign on the dash on the car with two arrows pointing up and down. The car won't give the option to raise it. It is in dynamic mode. What could it be?
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Old 01-09-2014, 01:37 PM   #2
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The car doesnt really seem to be lower in the front or the back. It seems to be equal in the front and the back
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Old 01-10-2014, 05:32 AM   #3
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That yellow car light means that the compressor was shutoff so it won't overheat. My guess is that you have a leak somewhere in the system which causes the pump to constantly run.

Do you ever get the green car with the down arrow light? should be right next to the yellow one.

If not your relay/fuse could be bad.
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Old 01-10-2014, 06:22 AM   #4
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Yea thats the light that used to be on the dash, and then it went to the yellow. I have a feeling it is a leak but im not really sure because all sides are the same.
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Old 01-10-2014, 06:40 AM   #5
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Quote:
Originally Posted by dmum93 View Post
Yea thats the light that used to be on the dash, and then it went to the yellow. I have a feeling it is a leak but im not really sure because all sides are the same.
...then it could be a stuck relay, assuming it did actually stop running.
Check it is not running and overheating due to stuck relay.
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Old 01-10-2014, 07:41 AM   #6
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when i shut the car off and then back on, it lets me change the suspension. and it goes up and down with no problem. but after i drive it for a little bit, the light comes on and then all suspension options are gone except for the one i am currently on.
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Old 01-10-2014, 07:46 AM   #7
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Do you have a vag-com? Check what codes you get, like already stated the relay could be bad. Otherwise there is a small leak, small enough that you don't notice your suspension losing air.
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Old 01-10-2014, 09:33 AM   #8
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I havent bought one yet but im going to my friends shop who has it. I'll let you guys know what codes I get
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Old 01-10-2014, 02:44 PM   #9
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so we plugged in the vagcom and it had a few red codes. but they had nothing to do with the suspension. there were no codes for suspension. he tweaked around with it for a little, lowered it about a half an inch while we were at it, and i drove about 100 miles since then and the problem hasn't happened again. i parked up at home, put it in standard, lifted perfectly fine. put it in lift, perfectly fine. put it back to dynamic, everything was good. ill be driving the car later tonight again, i hope the light doesn't come back on. but for now, its all good. doesn't even seem like its a relay or a leak. maybe it was just a malfunction?
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Old 01-10-2014, 02:45 PM   #10
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also, the compressor turned on and shut off perfectly fine
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Old 01-17-2014, 09:14 AM   #11
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Ok the problem came back. the yellow light is now always on. The ride heigh is all even. And its sitting normal but the ride is really stiff. What could it be?
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Old 01-17-2014, 09:30 AM   #12
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It is in limp mode. Shock absorbers set at firm. VCDS must show what's wrong. Post all of it here. Some faults may look unrelated if you don't have experience with them.
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Old 01-17-2014, 09:33 AM   #13
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Well I still havent gotten one yet. My other friend is an APR tuner so im gonna have him check it out and ill post it on here.
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Old 01-27-2014, 01:41 PM   #14
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so the code it gave me was 01772 for level control pressure sensor. i called the dealer for it and they told me that the car has 4 of them. any way to figure out which on it is?
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Old 01-27-2014, 01:57 PM   #15
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There is only one pressure sensor and it is on the valve block just behind the left front wheel.
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Old 01-27-2014, 02:30 PM   #16
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thats what i thought and told the dealer but he said no. anyways, any idea where i could buy one?
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Old 01-27-2014, 02:35 PM   #17
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as i said before, the car is perfectly level. i don't hear the compressor running, it is in limp mode, and it rides rough. any idea if it could be anything else other than that sensor? doesn't seem to be a leak since the compressor doesn't really run and the car is still perfectly leveled.
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Old 01-27-2014, 05:03 PM   #18
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You can get all kinds of inventive ideas but I would stick with VCDS scan results.

It looks like that sensor hasn't a separate part number and whole thing is quite expensive. I hope that somebody with on hand experience will kick in.
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Old 01-27-2014, 06:35 PM   #19
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i have a friend with a parts car a8. I'm pretty sure i could get one off of him. do you know if its separable from the unit?

and thank you for all your help, mishar!
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Old 01-27-2014, 11:05 PM   #20
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When I got my A8 it had a recurring 01772 G291 fault on the suspension. My local VAG specialist took a look over the suspension for me and found three issues which are now resolved.

1) One of the four level sensors had water ingress into the electrical connection which confused the suspension when it was driven on wet roads. He fixed this by cleaning up all the contacts, and used a non conductive grease before reassembling.

2) The car thought that all four corners were at different ride heights, so he recalibrated all four corners.

3) The compressor was only outputting 6 bar of pressure, this meant that although the car would raise and lower it did take forever for the front end to lift up. He fixed this by dismantling the compressor and fitting a repair kit which is readily available. The car now rises and lower perfectly, with the front raising smoothly and instantly after the rear has gone up.

Ultimately my 01772 was cured by rebuilding the compressor, the rest of the system was fine including the valve block.
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