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Bmw 745I Air Struts

Bmw 745I Air struts

Starting at $237.95, AutoBuffy stocks 28 air struts for the Bmw 745I from brands including Arnott, FCS, and Suncore. An air strut combines an air spring and shock absorber into a single unit, supporting the vehicle's weight while absorbing road impact. When one fails, ride height drops, handling suffers, and the compressor overworks — leading to costly secondary damage if ignored.

Signs your Bmw 745I air strut is failing

  • Corner of the vehicle sits noticeably lower than the others, especially after sitting overnight
  • Compressor runs constantly or cycles on and off repeatedly trying to maintain ride height
  • Harsh, bouncy, or wallowing ride quality that worsens over bumps and uneven pavement
  • Audible hissing or squeaking from a corner of the suspension, particularly when the vehicle is loaded
  • Warning light or air suspension fault message displayed on the dashboard
  • Uneven tire wear on the affected corner due to incorrect suspension geometry and load distribution

Which air strut should you buy for your Bmw 745I?

The main decision is whether to replace the air strut with a like-for-like air unit or convert to a conventional coilover. Within the air strut category, quality tier and whether the unit is fully assembled matter most for installation ease and long-term durability.

OE-Style Replacement Air Strut
Best for
Owners who want to preserve factory ride quality and air suspension features
What you get
Bolt-on fitment with air bladder and damper matched to factory specs; retains compressor and control system compatibility
Premium / Heavy-Duty Air Strut
Best for
High-mileage vehicles or those carrying heavy loads regularly
What you get
Upgraded bladder materials and valving for longer service life and better load handling compared to standard replacements
Complete Strut Assembly (with mount & bearing)
Best for
DIYers or shops wanting a single-step install
What you get
Pre-assembled unit including upper mount and spring perch; eliminates need for a spring compressor and reduces labor time
Air-to-Coil Conversion Kit
Best for
Owners looking to eliminate ongoing air suspension repair costs
What you get
Replaces the air strut with a passive coilover spring and shock; lower long-term cost but sacrifices auto-leveling and adaptive ride features

Air struts brands we stock for your Bmw 745I

Arnott
4 options · from $720.95
FCS
4 options · from $343.95
Suncore
4 options · from $254.95
Unity
4 options · from $237.95
Westar
4 options · from $367.95
Bilstein
4 options · from $569.95
Dorman
2 options · from $445.95
Monroe
2 options · from $779.95

Replacing air struts on a Bmw 745I

Advanced⏱ 2–4 hours per strutFloor jack and jack standsSocket and torque wrench setAir line disconnect toolScan tool capable of air suspension resetTrim panel removal tools (for accessing interior air line connections if required)

Replacing an air strut on the Bmw 745I involves safely lifting and supporting the vehicle, disconnecting the air line and electrical connector before removing the strut mounting hardware, and carefully lowering the knuckle to extract the old unit. A complete strut assembly avoids the need for a spring compressor. After installation, a suspension calibration with a compatible scan tool is typically required before returning the vehicle to normal operation.

Frequently asked questions

How much does it cost to replace air struts on a Bmw 745I?
Parts start at $237.95 for a single air strut for the Bmw 745I at AutoBuffy. Professional installation typically adds labor on top of that. Replacing in pairs is common practice, so budget accordingly. Opting for a complete assembly reduces labor time and can offset some of the total cost.
Can I drive my Bmw 745I with a failed air strut?
You should avoid driving on a failed air strut beyond what is necessary to reach a shop. The affected corner will sit low, degrading handling and braking. Continued driving forces the air compressor to run constantly, which can burn it out — turning a single strut repair into a much more expensive job.
Should I replace air struts in pairs on my Bmw 745I?
Yes, replacing axle pairs — both fronts or both rears together — is strongly recommended. Air struts wear at similar rates, and a new strut paired with a worn one creates side-to-side imbalance in ride height, handling, and load support. Replacing in pairs also saves on labor since the vehicle is already raised.
How long do replacement air struts last on a Bmw 745I?
Quality replacement air struts generally last several years or tens of thousands of miles, though lifespan varies with road conditions, load habits, and climate. Extreme cold can harden air bladders and shorten their life. Choosing a premium-grade unit and addressing any compressor or air line issues at the same time helps maximize longevity.
Do I need to reset or recalibrate the suspension after replacing an air strut on my Bmw 745I?
In most cases, yes. Many vehicles with electronic air suspension require a ride-height calibration or reset procedure after an air strut is replaced so the control module learns the new unit's baseline. This can often be done with a scan tool. Skipping calibration may leave fault codes active or cause the system to behave erratically.
What causes air struts to fail on the Bmw 745I?
The most common causes are age-related deterioration of the rubber air bladder, which cracks and leaks over time, and damper wear from high mileage. Road debris puncturing the bladder, corrosion on the air fitting, and water intrusion into the air lines are also frequent culprits. Compressor overwork from a slow leak often accelerates overall system wear.

Shop air struts by year for the Bmw 745I

2005200420032002

More parts for your Bmw 745I

Starter ArmatureEngine Oil Pressure SwitchTire Pressure Monitoring System (TPMS) Programmable Sensor Valve KitTransmission MountTransmission Drain PlugEngine Oil Level SensorAmbient Air Temperature Sensor ConnectorA/C Compressor Kit

Air struts for other Bmw models

Bmw 750iBmw 745eBmw 745Le xDriveBmw Alpina B7LBmw X5Bmw 760i