My car (2006, S211 wagon, 211.256 with Airmatic) has run ca 68360 miles. It began to show a sign "visit workshop (car raise)" on dashboard, only since few days. The sign does not appear when start the car, it appear after few minutes of drive. I did measure the level of the car after few days stay in garage, all wheel fender to ground only have few millimeters difference. I checked with iCarsoft, it throw the p5508 code. some other related information I listed below.

I have checked fuse and relay for compressor, it's OK. I guess it might be the compresssor is not function well, but I am not sure if could be a problem with a sensor, or other reason. I would appreciate if someone could help.

Information from iCarsoft:

BENZ_EN_TEST_00004>E(211)>From 06-2005 to 05-2006>T-Model>Gasoline>211.256 - E 350>Manual>Suspension>Read Fault Code:
Total Number : 5
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5111 1/5
State: Historic
B24/4(right front body acceleration sensor): Zero point variation
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5500 2/5
State: Historic
Critical vehicle level at front axle
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5501 3/5
State: Historic
Critical vehicle level at rear axle
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5503 4/5
State: Historic
Recovery time during filling of central reservoir is too long
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5508 5/5
State: Current <===================== ONLY ONE CURRENT CODE
The pressure line system leaks
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BENZ_EN_TEST_00003>E(211)>From 06-2005 to 05-2006>T-Model>Gasoline>211.256 - E 350>Manual>Suspension>View Data>Acceleration sensors:

Total Frames: 16 , Supported Items: 2
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Frame 1/16:
030 B24/3(Left front body acceleration sensor) ----- 2509.80mV
031 B24/4(Right front body acceleration sensor) ----- 2509.80mV
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Frame 2/16:
030 B24/3(Left front body acceleration sensor) ----- 2529.41mV
031 B24/4(Right front body acceleration sensor) ----- 2509.80mV
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Frame 14/16:
030 B24/3(Left front body acceleration sensor) ----- 2529.41mV
031 B24/4(Right front body acceleration sensor) ----- 2509.80mV
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Frame 15/16:
030 B24/3(Left front body acceleration sensor) ----- 2509.80mV
031 B24/4(Right front body acceleration sensor) ----- 2509.80mV
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Frame 16/16:
030 B24/3(Left front body acceleration sensor) ----- 2509.80mV
031 B24/4(Right front body acceleration sensor) ----- 2509.80mV

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>Suspension>View Data>Level Sensors:
Total Frames: 3 , Supported Items: 6
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Frame 1/3:
040 Signal 1 of component B22/8(Left front level sensor) ----- 2.37V
041 Signal 2 of component B22/8(Left front level sensor) ----- 2.37V
043 Signal 1 of component B22/9(Right front level sensor) ----- 2.14V
044 Signal 2 of component B22/9(Right front level sensor) ----- 2.14V
046 Signal 1 of component B22/3(Rear axle level sensor) ----- 2.86V
047 Signal 2 of component B22/3(Rear axle level sensor) ----- 2.86V
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>Suspension>View Data>Pressure sensor values:
Total Frames: 28 , Supported Item: 1
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Frame 1/28:
049 B7(AIRmatic pressure sensor) ----- 6.45bar

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>Suspension>View Data>Vehicle level:
Total Frames: 12 , Supported Items: 3
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Frame 1/12:
042 Left front vehicle level ----- -14mm
045 Right front vehicle level ----- -11mm
048 Rear vehicle level ----- -4mm
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Frame 12/12:
042 Left front vehicle level ----- -14mm
045 Right front vehicle level ----- -11mm
048 Rear vehicle level ----- -4mm

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Suspension>View Data>Voltages:
Total Frames: 10 , Supported Items: 2
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Frame 1/10:
091 Terminal 87 ----- ON
244 Terminal 30 ----- 13.90V
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Suspension>View Data>Wake - Up process:
Total Frames: 50 , Supported Item: 1
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Frame 1/50:
092 Wake-up process ----- OFF
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Frame 50/50:
092 Wake-up process ----- OFF