The Complete Guide to Infiniti QX56 Air Suspension Parts

The Infiniti QX56, known for its spacious interior and smooth ride, relies on an advanced air suspension system to deliver that signature comfort. Over time, components like air struts, compressors, and height sensors can wear out or fail. Understanding the key air suspension parts and knowing what to look for when replacing them can save you time, money, and frustration. This guide covers the essential Infiniti QX56 air suspension parts, common failure points, and practical advice for choosing replacements.

Understanding the Air Suspension System in the QX56

The air suspension on the Infiniti QX56 uses air springs (also called air struts or air shocks) instead of traditional coil springs. An air compressor inflates rubber bellows to raise the vehicle, and solenoid valves release air to lower it. Electronic height sensors monitor ride height and send signals to the control module, which adjusts air pressure to maintain level. The system provides a plush ride and automatic load leveling, but it can be prone to issues, especially in colder climates or on rough roads.

Key Components of the Air Suspension

• Air Struts / Air Springs: These combine the shock absorber and air spring into one unit. They are the most commonly replaced part, especially when the rubber bellows develop cracks or leaks.
• Air Compressor: The compressor pumps air to the struts. It often fails due to moisture contamination or overheating from constant cycling.
• Height Sensors: Located at each wheel, these sensors send position data to the control module. A faulty sensor can cause uneven ride height or the “Suspension Fault” warning.
• Solenoid Valves and Air Lines: Solenoids control air flow, and plastic air lines can crack or leak near fittings.
• Drier (Desiccant): Inside the compressor, the drier absorbs moisture. A saturated drier can cause corrosion and premature compressor failure.

Common Air Suspension Problems in the Infiniti QX56

Owners often report the following issues:

• Vehicle sagging overnight – Typically due to a leak in an air strut or air line.
• Compressor running constantly – Usually a sign of a small leak or a faulty height sensor.
• “Suspension Fault” warning on the dash – Can be triggered by low system pressure, a dead compressor, or electrical issues.
• Rough or bouncy ride – Worn air struts may lose damping ability even if they still hold air.
• Uneven stance – A failed height sensor or a stuck solenoid valve can cause one corner to sit higher or lower than the others.

Aftermarket vs. OEM Infiniti QX56 Air Suspension Parts

When it’s time to replace parts, you’ll face the choice between Original Equipment Manufacturer (OEM) parts and aftermarket alternatives. Here’s what to consider:

OEM Parts

OEM parts from Infiniti are exact-fit and typically offer the highest reliability. However, they are also the most expensive. For example, a single OE air strut can cost over $1,000. If your QX56 is still relatively new or under warranty, OEM may be the safer route.

Aftermarket Parts

Many reputable aftermarket brands produce Infiniti QX56 air suspension parts at a fraction of the OEM cost. Brands like Arnott, Air Lift, and Dorman offer replacement struts, compressors, and repair kits. Aftermarket parts may use improved materials (such as reinforced rubber bellows) that last longer than OEM in some cases. However, quality can vary widely. Look for brands that offer a warranty (e.g., lifetime or 2-year) and that meet or exceed OE specifications.

Remanufactured Parts

For compressors and some struts, remanufactured units can be a cost-effective option. These are factory-refurbished with new seals and bearings. Make sure the supplier provides a warranty and a clear exchange policy.

Practical Tips for Buying Infiniti QX56 Air Suspension Parts

• Diagnose the exact problem before buying any parts. A simple fix like replacing a leaking air line or a corroded connector can save you from replacing expensive struts. Use a scan tool to read fault codes, or visually inspect for cracks in rubber bellows and lines.
• Replace components in pairs (both front or both rear) when changing air struts. Uneven wear can lead to handling issues and premature failure of the new part.
• Check the compressor drier when replacing a compressor. If the drier is saturated, it can ruin the new compressor quickly. Some aftermarket compressors come with a new drier included.
• Inspect height sensors during suspension work. They are relatively inexpensive and can cause phantom leaks if worn.
• Consider a conversion kit if you plan to keep the vehicle long-term. Some owners swap the air suspension for a conventional coil-over conversion (e.g., from Strutmasters or Arnott). This eliminates future air suspension issues but changes the ride quality.

DIY vs. Professional Installation

Replacing an air strut on the QX56 is moderately difficult. The job requires lifting the vehicle, removing the strut assembly, detaching air lines and electrical connectors, and then bleeding the system after installation. Special tools like spring compressors (for some models) may be needed. If you are mechanically inclined and have a good floor jack and stands, you can do the job in a weekend. However, for compressor replacement or full system troubleshooting, professional installation is often safer, as incorrectly installed parts can lead to system damage or safety issues.

Final Recommendation

For most Infiniti QX56 owners, the best value comes from high-quality aftermarket air struts paired with a new or remanufactured compressor from a reputable brand. Avoid the cheapest no-name parts, as they often fail within a year. If budget allows, OEM struts are a solid choice for longevity. Always replace the compressor drier and inspect all air lines and height sensors when doing major suspension work. For those tired of recurring air suspension problems, a coil-over conversion kit may be the most practical long-term solution, though it will alter the ride comfort.

Take the time to diagnose accurately, buy from trusted suppliers, and don’t cut corners on installation. With the right parts and care, your Infiniti QX56 can return to its smooth, leveled ride for many more miles.