2021-2025 Tesla Model S Air Strut: Diagnosing Clunks, Leaks, and Ride Height Issues

Symptoms of a Failing Model S Air Strut

Failure in the air suspension system can manifest in several ways, from unusual noises to noticeable changes in the vehicle's stance and handling. The heavy weight and powerful acceleration of the Model S can put significant stress on these components.

Clunking or Knocking Noises

A clunking, knocking, or crunching sound when driving over bumps, especially at lower speeds or when turning, is a common indicator of a suspension problem. This noise often points to wear in the strut's internal components, the top mount, or related parts like control arm bushings and sway bar end links. While the strut itself can be the cause, it's important to inspect these related components as well, as they can produce similar sounds.

Vehicle Leaning or Sagging

If you notice your Model S is sitting lower on one corner than the others, especially after being parked overnight, it's a strong sign of an air leak in the strut for that corner. This happens because the air bladder can no longer hold pressure, causing that part of the suspension to sag. This can also be caused by a faulty ride height sensor, but a leaking strut is a more common culprit.

Hissing Sounds

A faint but audible hissing sound coming from one of the wheel wells, especially when the car is parked and the suspension is trying to adjust, points directly to an air leak. The leak is often caused by small cracks or punctures in the rubber air spring, which can develop over time due to age and environmental exposure.

"Suspension Needs Service" Warning

The vehicle's diagnostic system will often detect a problem before it becomes severe. An orange or red warning light on the instrument cluster, sometimes accompanied by a message like "adaptive ride control unavailable," indicates a fault in the air suspension system. 🎬 Watch this step-by-step guide to diagnosing and fixing common issues. This could be due to a leak, a failing compressor, or a sensor issue. A persistent leak will cause the air compressor to run excessively, which can lead to premature failure of the compressor itself.

Known Issues, Recalls, and Service Bulletins

As of early 2026, there are no specific NHTSA recalls for the suspension struts on the 2021-2025 Tesla Model S. However, older Model S and Model X vehicles were subject to investigations regarding front suspension fore link failures, though these did not result in a formal recall in the US. While not directly related to the strut assembly, it highlights that Tesla suspension components can be a point of concern for owners. The majority of reported issues for the 2021 model year relate to the electrical system, steering, and forward collision avoidance systems.

Buying a Used 2021-2025 Model S Strut: What to Look For

Given the high cost of new OEM parts, a used, low-mileage strut is a practical option. However, careful inspection is key to avoiding a part that will fail prematurely.

• Verify the Part Number: This is the most critical step. The provided OEM part numbers (e.g., 1420361-00-G, 1420467-00-B) are a starting point, but many revisions exist. Always match the full part number from your vehicle's original strut to the replacement part.
• Inspect the Air Bladder: Carefully examine the rubber air spring for any signs of cracking, perishing, or abrasions. Pay close attention to the areas where the rubber folds. A healthy bladder should be pliable and free of visible defects.
• Check for Leaks: Look for any oily residue on the body of the strut. While these are air struts, the integrated damper contains hydraulic fluid. A leak from the damper portion means the entire unit is compromised and should be rejected.
• Examine the Electrical Connector: The adaptive damping function is controlled electronically. Inspect the electrical connector for any bent, corroded, or broken pins. A damaged connector can render the strut's adaptive features useless.
• Consider Mileage: While there's no exact failure mileage, suspension components on a heavy, high-performance vehicle like the Model S experience significant stress. A part from a vehicle with lower mileage (e.g., under 60,000 miles) is generally a safer bet.

Cost to Replace a Tesla Model S Air Strut

Replacing an air strut on a Model S is more expensive than on a conventional vehicle. Prices can vary based on location and whether you choose a new, used, or aftermarket part.

Replacement Overview & Special Procedures

Replacing a Model S air strut is a job that can be done by an experienced DIY mechanic, but it requires specific procedures to be followed for safety and proper function.

Key Torque Specs:

Always use a torque wrench for installation. While specs can vary slightly by position (front/rear) and revision, common values from Tesla service manuals are:

• Top Mount Nuts (x3): 39 Nm (Front) or 40 Nm (Rear)
• Lower Strut to Control Arm Bolt: 140 Nm (Front) or 98-130 Nm (Rear, depending on bolt)
• Air Line Fitting: 5 Nm

Note: These values are for reference. Always consult the specific service procedure for the exact part you are replacing. 🎬 See this walkthrough for replacing the front air suspension assembly. It is critical to only tighten suspension bolts to their final torque value when the vehicle's weight is on the suspension (i.e., on the ground or on a drive-on lift).

Post-Replacement Requirements:

A four-wheel alignment is mandatory after replacing a strut. Skipping this step will lead to poor handling and rapid, uneven tire wear, which is a known issue on these vehicles.

Frequently Asked Questions (FAQ)