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2018 QX80 Air Suspension Sagging and Compressor Noise

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Mike T. · rep 0 · May 25, 3:51 AM · 1 replies · solved · Question

Vehicle: 2018 Infiniti QX80 Limited

I've got a 2018 Infiniti QX80 Limited, and lately, I've noticed the rear end seems to be sagging, especially after sitting overnight. When I start the car, I can hear the air suspension compressor running for a much longer time than usual, trying to level the vehicle.

It's not always completely flat, but it's definitely lower than it should be, and the ride quality feels a bit stiffer sometimes. I'm concerned about potential air leaks or a failing compressor. Is this a common problem for the QX80s around this model year? What parts are typically involved in these repairs?

I'm looking for advice on whether this is something I can troubleshoot myself or if it's an immediate trip to the mechanic. I want to make sure I get the right parts if I need to replace anything.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:51 AM

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ClearTheCode admin answer:

The sagging rear end and prolonged compressor noise in your 2018 Infiniti QX80 are classic symptoms of issues within the vehicle's self-leveling air suspension system. This is a relatively common problem in vehicles equipped with air suspension as components age.

  1. Air Spring/Strut Leaks: The most frequent cause is a leak in the air springs (also known as air bags or air struts) themselves. Over time, the rubber components of the air springs can degrade, crack, or develop small punctures, allowing air to escape. This causes the suspension to sag when the vehicle is parked and forces the compressor to work harder to re-inflate them.
  2. Air Compressor Wear: If the air springs are leaking, the compressor has to run more frequently and for longer durations. This excessive workload can lead to premature wear and tear on the compressor, eventually causing it to fail or become less efficient. The prolonged noise you hear suggests the compressor is struggling.
  3. Air Lines and Valve Block Leaks: Less commonly, leaks can occur in the air lines that connect the compressor to the air springs, or in the valve block which controls air distribution. These leaks can be harder to pinpoint.
  4. Height Sensor Malfunction: While not directly causing leaks, a faulty height sensor could send incorrect signals to the control module, leading to improper leveling. However, the sagging when parked strongly suggests an air leak. OBD codes related to air suspension can include C1101 (Front Right Air Suspension Sensor Malfunction), C1102 (Front Left Air Suspension Sensor Malfunction), or codes related to compressor performance if the issue is severe.

When to see a shop:

Addressing air suspension issues promptly is important, as continued driving with a compromised system can lead to further damage to the compressor or uneven tire wear. While you can visually inspect for obvious leaks (sometimes soapy water can help identify small leaks), diagnosing the exact source of a leak and replacing air suspension components typically requires specialized tools and expertise. It's best to take your QX80 to an Infiniti dealership or a shop experienced with air suspension systems. They can accurately diagnose the leak, check the compressor's health, and replace the faulty parts (usually air springs or the compressor) with genuine or high-quality aftermarket components.

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