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2020 Aviator Reserve Air Suspension Warning & Sagging Issue

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Mike T. · rep 0 · May 24, 3:34 PM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Aviator Reserve

Hey everyone, I'm hoping someone here has experienced this or can offer some advice. I have a 2020 Lincoln Aviator Reserve, and recently, the 'Air Suspension Malfunction' warning light has popped up on my dash.

The car also feels like it's riding much lower than usual, especially in the rear, and the ride quality has become noticeably harsher. It almost feels like the suspension isn't absorbing bumps at all. This started about a week ago, seemingly out of nowhere.

Has anyone dealt with this on their Aviator? Is this a common issue for this model year? I'm trying to figure out if it's something simple like a fuse or a sensor, or if I'm looking at a major repair like a new compressor or air springs. Any thoughts on what might be causing it or if there are any DIY checks I can do before taking it to the dealership?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 24, 3:34 PM

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ClearTheCode admin answer: Air suspension issues can be concerning, especially on a premium SUV like your 2020 Lincoln Aviator. The symptoms you're describing—warning light, sagging, and a harsh ride—are classic indicators of a problem within the air suspension system.

Here’s a breakdown of common causes and what steps to consider:

  1. Common Causes:

    • Air Spring Leaks: The most frequent culprit. Over time, the rubber air springs (often called air bags) can develop cracks or small holes, leading to air loss. This causes the vehicle to sag, particularly when parked overnight.
    • Air Compressor Failure: The compressor is responsible for maintaining air pressure in the system. If it fails, or if it's overworked due to a leak, it can stop inflating the springs.
    • Height Sensor Malfunction: These sensors tell the control module the vehicle's ride height. If a sensor fails or gets dirty, it can send incorrect signals, leading to improper inflation or deflation.
    • Air Suspension Control Module Issues: Less common, but the electronic brain controlling the system can sometimes malfunction.
    • Air Line Leaks: Hoses connecting the compressor to the air springs can also develop leaks.

  2. Initial Checks (Limited DIY):

    • Visual Inspection: Park your Aviator on a level surface and visually inspect the air springs (located near the wheels) for any obvious damage, cracks, or signs of air leakage (sometimes you can hear a hiss).
    • Listen to the Compressor: With the car on, listen for the air compressor. It's usually located under the vehicle or in the trunk area. If it's running excessively or not at all, it could indicate a problem.
    • Check for Codes: While generic OBD-II scanners might not pick up specific air suspension codes, a more advanced scanner can read codes from the chassis or suspension control module (e.g., C-codes like C1A00, C1A20, C1A30, or C1A40). These codes are crucial for proper diagnosis.

  3. When to See a Shop:

    • Immediate Action: If your Aviator is significantly sagging or the ride is dangerously harsh, you should limit driving it. Continued driving can put stress on other suspension components and potentially damage the compressor further.
    • Professional Diagnosis: Air suspension systems are complex and require specialized diagnostic tools and knowledge for accurate repair and calibration. A qualified technician can pinpoint the exact cause, whether it's a leaky air spring, a faulty compressor, a sensor, or a control module. They can also perform necessary system calibration after repairs.
    • Safety: Do not attempt extensive DIY repairs on air suspension components without proper tools and safety precautions, as the system operates under high pressure.
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