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2017 QX80 Rear Sagging & 'Service Air Suspension' Message

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

Vehicle: 2017 Infiniti QX80 AWD

Hi everyone,

I've got a 2017 Infiniti QX80 with around 70,000 miles, and lately, I've noticed the rear end is sagging significantly, especially after sitting overnight. When I start the car, it eventually levels out, but it takes a while, and sometimes I get a 'Service Air Suspension' message on the dash. It's making the ride feel a bit bouncy too.

I'm guessing this is related to the air suspension system. Is this a common failure point for the QX80 at this mileage? What components typically fail, and how expensive is it to fix? I want to make sure I'm prepared for what the mechanic might tell me. Thanks for any insights!

✓ Accepted solution

ClearTheCode Admin

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

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ClearTheCode admin answer:

Rear sagging and a 'Service Air Suspension' message on your 2017 Infiniti QX80 are classic symptoms of a fault within the vehicle's self-leveling rear air suspension system. This system is designed to maintain a consistent ride height regardless of load, and its components can wear out over time.

Here are the most common culprits:

  1. Air Springs (Air Bags): These are the most frequent failure point. Over time, the rubber material of the air springs can dry rot, crack, or develop small leaks, especially at 70,000 miles. A leaking air spring will cause the vehicle to sag as air escapes, particularly when parked. When the car starts, the compressor attempts to reinflate them.
  2. Air Compressor: The compressor is responsible for pumping air into the springs. If it's failing, weak, or has a leak in its lines, it might struggle to inflate the springs to the correct pressure or take too long, triggering the warning message. Constant cycling due to a leak elsewhere can also wear it out prematurely.
  3. Height Level Sensors: These sensors monitor the vehicle's ride height and tell the compressor when to activate. If a sensor is faulty, damaged, or out of calibration, it might send incorrect readings, leading to improper leveling or system faults. Common DTCs include C1130 (Rear Right Air Suspension Sensor Circuit) or C1140 (Rear Left Air Suspension Sensor Circuit).
  4. Air Lines/Valves: Less common, but a leak in the air lines or a faulty solenoid valve can also cause air to escape and lead to sagging.

When to See a Shop:

  • As soon as possible: While not immediately dangerous, continuous driving with a faulty air suspension can lead to uneven tire wear, compromised handling, and put extra strain on other suspension components. If the compressor is constantly running to compensate for a leak, it will eventually burn out.
  • For diagnosis: A qualified technician will use diagnostic tools to read specific fault codes related to the air suspension system and perform a visual inspection for leaks (often using a soapy water solution) to pinpoint the exact source of the problem. Repair costs can vary significantly depending on whether it's just an air spring, the compressor, or a sensor, but expect a few hundred to over a thousand dollars per component, plus labor.
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