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2018 S560 Air Suspension Sagging Overnight - Compressor Noise

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Laura J. · rep 0 · May 22, 4:21 AM · 1 replies · solved · Question

Vehicle: 2018 Mercedes-Benz S560

Hello everyone,

I own a 2018 Mercedes-Benz S560, and I've noticed a concerning issue with the air suspension. When the car is parked overnight, especially in colder weather, the front end (sometimes one side more than the other) sags noticeably. It looks like it's completely deflated.

When I start the car, the air compressor kicks in and runs for quite a while, making a louder-than-usual whirring noise, before the car eventually levels out. This has been happening more frequently over the past few weeks.

Is this a common problem for the S-Class? What could be causing this, and what kind of repair costs am I looking at? I'm worried about driving it like this.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:21 AM

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ClearTheCode admin answer:

Air suspension issues, particularly sagging and an overworked compressor, are a known concern for many luxury vehicles, including the Mercedes-Benz S-Class like your 2018 S560. This system relies on a complex interplay of components, and failure in one can affect the whole system.

Here are the most common causes:

  1. Air Spring/Strut Leaks: This is the most frequent culprit. The rubber bladders (air springs) within the struts can develop small cracks or punctures over time, allowing air to escape, especially when the vehicle is parked. This leads to sagging.
  2. Air Line Leaks: The plastic air lines connecting the compressor, valve block, and air springs can also develop leaks, often at the fittings or due to rubbing against other components.
  3. Air Suspension Compressor Failure: If the compressor is running excessively and making unusual noises, it could be failing. This often happens as a secondary issue if there's a leak elsewhere, forcing the compressor to work harder and eventually burn out. A failing compressor might also struggle to generate sufficient pressure.
  4. Valve Block Malfunction: The valve block controls the air distribution to each air spring. If it's faulty, it might not properly hold air in certain struts or distribute it unevenly.
  5. Ride Height Sensor Issues: While less common for sagging, a faulty ride height sensor could give incorrect readings, leading the system to try and compensate incorrectly.

Diagnostic Trouble Codes (DTCs): You might see codes like C1501 (Air Suspension Malfunction), C1503 (Compressor Malfunction), or codes specific to individual air spring pressure sensors.

When to See a Shop:

It's crucial to have your S560 inspected by a Mercedes-Benz specialist immediately. Driving with a compromised air suspension can affect handling, braking, and tire wear. An overworked compressor will eventually fail completely, leaving your car undriveable. A professional can pinpoint the exact leak location or component failure using specialized diagnostic tools and leak detection methods.

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