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2020 Aviator Air Suspension Sagging - Warning Light On

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Dan C. · rep 0 · May 22, 6:05 AM · 1 replies · solved · Question

Vehicle: 2020 Lincoln Aviator Reserve

Hey everyone, hoping for some advice here. I have a 2020 Lincoln Aviator Reserve, and I've been noticing some weird issues with the air suspension lately.

The rear of the vehicle seems to be sagging, especially after it's been parked overnight. Sometimes, when I start it up, it takes a while to level out, and other times it just stays low. I've also had the 'Air Suspension Fault' warning light pop up on the dash a few times.

It's not constant, but it's happening more frequently now. The ride quality also feels a bit off, a bit bouncier than usual. Has anyone else experienced this with their Aviator? What could be causing it?

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

It sounds like your 2020 Lincoln Aviator Reserve is experiencing common symptoms of an air suspension system fault. This system relies on several components working in harmony, and a failure in any one can lead to sagging, warning lights, and compromised ride quality.

Here are the most common causes and what to consider:

  1. Air Leaks: This is perhaps the most frequent culprit. Over time, air springs (bags), lines, or fittings can develop small leaks. If the rear sags overnight, it's a strong indicator that air is escaping from the system.
  2. Air Compressor Failure: The compressor is responsible for pumping air into the springs to maintain ride height. If it's weak, failing, or constantly running, it might not be able to keep up with demand, or it could be overworked due to a leak.
  3. Ride Height Sensors: These sensors tell the control module the current height of each corner of the vehicle. If a sensor is faulty or miscalibrated, it can send incorrect signals, causing the system to inflate or deflate incorrectly.
  4. Air Suspension Control Module: Less common, but the module itself can fail, leading to erratic behavior or complete system shutdown.

Diagnostics & When to See a Shop:

  • Visual Inspection: Check around the air springs for any obvious damage or cracks. Listen for hissing sounds when the vehicle is running or after it's been parked.
  • OBD-II Scan: A professional diagnostic scan tool can read specific air suspension fault codes (e.g., C1800 - Ride Height Sensor Circuit Fault, C1810 - Air Suspension Compressor Fault, C1820 - Air Spring Solenoid Fault). These codes will pinpoint the exact area of concern.
  • Professional Help: Given that the warning light is on and the ride quality is affected, it's highly recommended to have your Aviator inspected by a qualified technician. They have specialized tools to test for leaks, check compressor function, and diagnose sensor issues accurately. Driving with a compromised suspension can affect handling and tire wear. Addressing it promptly can prevent further damage to other components like the compressor, which might be overworking itself.
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