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On Mercedes-Benz vehicles with air suspension, if you see diagnostic trouble code 5501, it means there's a serious issue with the rear vehicle level. To get a detailed analysis and accurate diagnosis, it's recommended to use a STAR machine instead of a regular scan tool. Typically, the problem may be attributed to a malfunctioning air suspension compressor, a faulty air strut, leaking air lines, or a defective relay. Another possibility is a malfunctioning level sensor. To start diagnosing the issue effectively, more information is required. While you can visually inspect the indicated components, there's a chance you might find the problem that way.
If your Mercedes is displaying a 5501 code, it indicates a severe issue with the rear portion of your car's airmatic suspension system.