D3 suspension fault codes after changing all front arms

[reb78]

Hi Folks.
I changed both upper and lower suspension arms on the D3 recently.

Following this I had a 4 wheel hunter alignment done and reset the SAS as per the book.

I have since been getting intermittent RLM fault codes:

C112F - Air spring valve actuator stuck open, actuator stuck open
and
C1130 - Air spring air supply. Signal has too many transitions/events

I cant see how these are related to the change of arms, alignment and SAS reset, but they have only come on since. I did deflate the air springs as part of the arm change process, but they were taken out of this mode once the job was done.

Any ideas what to do? I have cleared the codes and cycled the suspension several times and all fine after a drive, but it is intermittent.

Only other odd thing was I checked the centre hub to arch measurements with the car sat on level ground and running and they werent exactly close to 466 and 485:

Front Left - 483mm
Front Right - 493mm
Back Right - 495mm
Back Left - 479mm

Might need to calibrate the height but is this going to mean that the newly installed bushes are then all stressed as they were likely at the heights above when the alignment was done? Kicking myself for not checking them before it had the alignment now but before the arm change it had no issues.

Compressor was rebuilt 12 months ago using a kit from 4x4air seals and has worked perfectly since then.

It's not sinking or sitting funny and seems to rise/fall/stay as it should.

Any thoughts?

 

[hotponyshoes]

My guess would be the faults are as the codes say.
Not directly anything to do with changing the arms but, because you've drained and refilled the air bags the valve has got stuck at the same time as its been pushed into a position its not used for a while.

Personally, I'd ignore it, drive around for a week then check it again. That seems to sort out my D4 after messing with the arms and I think the 3 and 4 are pretty much the same?

 

[reb78]

My guess would be the faults are as the codes say.
Not directly anything to do with changing the arms but, because you've drained and refilled the air bags the valve has got stuck at the same time as its been pushed into a position its not used for a while.

Personally, I'd ignore it, drive around for a week then check it again. That seems to sort out my D4 after messing with the arms and I think the 3 and 4 are pretty much the same?

Thanks. This is where I am at. I reckon deflating it has done as you say. I've cycled from access to normal to high a few times and it's all behaving.

 

[hotponyshoes]

I've done all the arms on mine, in pairs, 2 at a time.
Each time iv had some sort of (seemingly unrelated) errors afterwards. All cleared themselves in a few days/miles (after wheel alignment)

Don't try and recalibrate ride height if there are any fault codes showing.

I did do the before/after height measurements the first time I did mine as I was nervous about messing it up.
It wasn't even to start with (although it was not new when I got it so the arms may have been changed before)
Different afterwards. I think I worked out that the sensor arms had a 10:1 ratio so if the mounting bracket on the replacement arm was only 1mm diffrent the ride height sensed would be 10mm out.

I did recalibrate it once. But, if you (without doing anything) check all your hub/arc heights again tomorrow they'll be more than 10mm out anyway.
Basically, I've never bothered recalibrating again and not noticed any difference in driving it.

 

[reb78]

Again. Exactly what I have found before too so have tended to do nothing about those heights. They are always different. Interesting to know those ratios. 1mm makes a lot of difference.