markgm

About a month ago while exiting the highway my car (2010 E550) showed an up arrow with the word 'Malfunction' in the dash. I replaced the relay, and the issue went way, until today. When I was on the highway the message came back again. I intend see what the specific error is, but from what I'm reading online it looks like the compressor is going (the car does not lose height over night, nor does it handle differently that I can tell).

Assuming the compressor turns out to be defective, does anyone know a good place to pick up a new one, and are there instructions out there on how to replace it? It looks like it is in the trunk in front of the air tank, which might make it easier to replace than the cars with it behind the front bumper.

KEY08

$549 at Arnott and if you Google the model number you can find it cheaper. I have not seen too many of these replaced in the W212.

https://www.arnottindustries.com/par...ml#prettyPhoto

markgm

Thanks, do you know if it's an improvement over the OEM part? I see they have replacement instructions, looks like the compressor is under the car near the back left.

markgm

Well the plot thickens. Xentry gives this error:

C155E13 The pressure relief valve for the system pressure has a malfunction. There is an open circuit.

Possible cause and remedy: Component 'A9/1y1 (AIRMATIC pressure relief valve)' has a malfunction.

It looks like the pressure relief valve is part of the compressor. Another person had a similar issue, but his rear was sagging too (I can't raise my vehicle, but otherwise it seems to work fine). Turns out it was a chafed wire. I'll pull the cover down this weekend and take a look to see if I can see anything.

KEY08

Yes, you are referencing this?:

https://mbworld.org/forums/e-class-w...s-way-out.html

Once again, I cannot remember anyone replacing a compressor on the W212, whereas with the W211 it was pretty rampant.

markgm

This was the one I was referring to: http://www.benzworld.org/forums/w212...-airmatic.html

It seems most people who have AIRMATIC issues have sagging issues, but mine isn't sagging, it just won't raise. I'll try to pull the cover this weekend and see if anything stands out.

markgm

Well the previous thread I linked turned out to be the solution to my issue as well. The first two photos show the error I saw in Xentry related to the open circuit for the pressure relief valve. I popped the cover off of where the air compressor is (the 3rd picture is of the 4th bolt by the heat shield that is a little hidden).

Once the cover was off, I was amazed at what I saw. Right in front (4th picture) you can see where the hockey tape has worn off the wires leading to the compressor (the red). Behind that wire you can just make out the wire going to the pressure relief valve. There you can see the plastic covering is cracked. Turns out it (and the wire) is very brittle.

The 5th picture is the connector for the pressure relief valve. It looks to be in good shape, so my heart sunk a little that this would be an easy fix. I pulled the wire harness away from the car. I couldn't believe what I saw. In the 6th picture you can see where the frame of the car rubbed right through the plastic. When I cut the zip tie, you can see (7th picture) that the plastic has been cracked in 2 places. Still, I didn't see any broken wire.

I then disconnected the wiring harness to the pressure relief valve, and when I pulled the wire through, one wire kept coming! The 8th photo shows the problem. As you can tell from the 9th picture, it was exposed to the elements for quite some time. I put in a new wire, put on lots of shrink tubing, and zip tied the wires away from the frame of the car. Hopefully this helps anyone else with this issue. What a crappy design.

Madowl

QUOTE=markgm;6725954]Well the plot thickens. Xentry gives this error:

C155E13 The pressure relief valve for the system pressure has a malfunction. There is an open circuit.

Possible cause and remedy: Component 'A9/1y1 (AIRMATIC pressure relief valve)' has a malfunction.

It looks like the pressure relief valve is part of the compressor. Another person had a similar issue, but his rear was sagging too (I can't raise my vehicle, but otherwise it seems to work fine). Turns out it was a chafed wire. I'll pull the cover down this weekend and take a look to see if I can see anything.[/QUOTE]

Hi Markgm, have you resolved this problem? My w212 facelift is going to the garage on Wednesday with the exact same fault code C155E13.
Would really appreciate any help

markgm

Hi Markgm, have you resolved this problem? My w212 facelift is going to the garage on Wednesday with the exact same fault code C155E13.
Would really appreciate any help [/QUOTE]

Yep, my issue was the same as the others, the wire was cut. I spliced it back together and it's been working fine ever since.

This is the only car I've ever owned where so many owners have exactly the same issues pop up.

Madowl

Markgm - do you know if this fault could cause the back suspension to sagg/sit lower than normal?
Thanks in advance

markgm

Mine didn't sit low, it just wouldn't raise, but as I mentioned in my original post, I felt like I was the exception. Every other post I read about this issue mentioned that the car sat lower than normal. Perhaps mine would have if I didn't repair the wire right away.

AMG3.2

What a thread. Can't wait to see the finished product.

Dassi

The Work you have done is simply amazing. I have a question for you, are you planning on upgrading your dash switches?
if so do you think they are simply plug in play action?

Kobzarhomes

.

Petterepost

Hi!

Thank you very much.
My car MB w212, 200 E - class, 2010 had the same problem. Both Air bellows was flat. It happens the first night when the temprature was -2,5 C. The days before the temprature was about +14C outside. Low temprature makes bad wires to malfunction.

Diagnose: "C155E13 pressure relief valve"

The pressure relief valve for the system pressure has a malfunction. There is an open circuit.

I my case it was the red wire that was broken. I just pulled hard first the green wire, that was not broken. When I pulled hard on the red wire it came lose. Clearly the red wire was broken. I just connected the wires back and started the car. The air bellows raised and the problem was fixed.

Thank you.

Petterepost

Hi!

Thank you very much.
My car MB w212, 200 E - class, 2010 had the same problem. Both Air bellows was flat. It happens the first night when the temprature was -2,5 C. The days before the temprature was about +14C outside. Low temprature makes bad wires to malfunction.

Diagnose: "C155E13 pressure relief valve"

The pressure relief valve for the system pressure has a malfunction. There is an open circuit.

I my case it was the red wire that was broken. I just pulled hard first the green wire, that was not broken. When I pulled hard on the red wire it came lose. Clearly the red wire was broken. I just connected the wires back and started the car. The air bellows raised and the problem was fixed.Thank you.