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2020 Aviator Reserve: Rear Air Suspension Sagging & 'Service Suspension' Message

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Rachel A. · rep 0 · May 22, 6:05 AM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Aviator Reserve

Hey everyone,

I'm having an issue with my 2020 Lincoln Aviator Reserve, which has the optional Air Glide Suspension. Lately, I've noticed the rear end of the vehicle seems to be sagging, especially after it's been parked overnight. It usually levels out once I start driving, but it takes a few minutes.

More concerning, I've started getting a 'Service Suspension' message on the dashboard. It's not constant, but it pops up intermittently, usually when I first start the car or after driving for a bit. There aren't any strange noises, just the visual sag and the warning light.

Has anyone else experienced this with their Aviator? I'm trying to figure out if this is a common problem or if I should be preparing for a major repair. Any advice on what to check or what might be causing it would be greatly appreciated. Thanks!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 6:05 AM

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Hi Sarah,

It sounds like you're experiencing a common issue with air suspension systems, particularly the Air Glide Suspension on your 2020 Lincoln Aviator Reserve. The symptoms you describe – rear sag after parking and the 'Service Suspension' message – strongly suggest a problem within the air suspension system.

Here's a breakdown of potential causes and what to do:

  1. Air Leak in the System: This is the most frequent culprit. Over time, air springs (air bags), air lines, or fittings can develop small leaks. When the vehicle is parked, air slowly escapes, causing the suspension to sag. Once the engine starts, the air compressor attempts to re-inflate the system, which is why it levels out.

    • Diagnosis: A shop can use a soapy water solution to spray on components and look for bubbles, indicating a leak.

  2. Faulty Air Compressor: The compressor is responsible for pumping air into the system. If it's weak, failing, or has a leak itself, it won't be able to maintain proper pressure, especially after a leak or during extended parking.

    • Diagnosis: Listen for unusual noises from the compressor (often located in the rear of the vehicle). A shop can test its output pressure.

  3. Height Sensor Malfunction: The vehicle's computer uses height sensors at each wheel to determine the correct ride height. If a sensor is faulty, it might send incorrect readings, causing the system to either over-inflate, under-inflate, or trigger a warning.

    • Diagnosis: OBD-II codes related to height sensors (e.g., C1A00 - General Malfunction, C1A20 - Pressure Sensor Fault) would typically appear.

  4. Control Module Issues: Less common, but the air suspension control module could be failing, leading to incorrect operation or error messages.

When to See a Shop: Given the 'Service Suspension' message, it's highly recommended to have your Aviator inspected by a qualified technician as soon as possible. While the car might still drive, continued operation with a compromised suspension can lead to:

  • Uneven tire wear.
  • Reduced handling and stability.
  • Increased strain on other suspension components.
  • Potential damage to the air compressor if it's constantly overworking to compensate for a leak.

They will be able to scan for specific diagnostic trouble codes (DTCs) that will pinpoint the exact area of concern, whether it's a leak, a sensor, or the compressor itself.

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