2025-2026 MINI Cooper Hatchback Strut: A Buyer's Guide for Manual Liftgates
This guide covers failure symptoms, replacement, and how to buy a used hatchback strut for the 2025-2026 MINI Cooper, focusing on the critical difference between manual and power liftgates.
- This strut (part no. 51-24-5-A31-C05) is ONLY for 2025-2026 MINI Coopers with a MANUAL liftgate; it will not work on models with the optional power liftgate.
- Failure symptoms include the hatch sagging, being hard to lift, or slamming shut. A leaking, oily appearance is a definitive sign of failure.
- Replacement is a very easy DIY job, requiring only a flathead screwdriver and a way to prop the hatch open. Always replace struts in pairs.
- Because the vehicle is new, used OEM struts are a great value, but inspect them carefully for collision damage like dents or bent rods.
Symptoms of a Failing Hatchback Strut
Because the 2025-2026 MINI Cooper is a new generation, widespread part failures are not yet documented. However, hatchback struts are a common wear item on all vehicles. Expect to see these general symptoms as the vehicle ages.
- Hatch Won't Stay Open: The most common symptom is a hatchback that slowly sags down after being opened or won't stay fully open on its own. This happens when the strut loses enough gas pressure to counteract the weight of the hatch.
- Difficult to Open: You find yourself needing to use significant physical effort to lift the hatch. A functional strut should assist with the lift, making it feel relatively light.
- Hatch Slams Shut: A completely failed strut provides no resistance, causing the heavy hatch to close quickly and forcefully once you let go. This is a serious safety hazard.
- Visible Leaks or Damage: Oily residue on the strut's black cylinder or shiny piston rod indicates a seal failure. Dents, corrosion, or a bent rod are also clear signs the strut needs replacement.
- Hissing Sounds: An audible hissing noise when opening or closing the hatch can mean the nitrogen gas is actively leaking out through a failed seal.
Warning: This lift support is for models with a manual liftgate only. It will not fit vehicles equipped with the optional power liftgate system, which uses a different, motorized strut. 🎬 Watch: How to fix a broken power liftgate strut Always verify which system your vehicle has before purchasing.
Known Issues, TSBs, and Recalls
As of mid-2026, there are no known recalls, Technical Service Bulletins (TSBs), or widespread issues reported specifically for the hatchback struts on the 2025-2026 MINI Cooper. This is typical for a newly released vehicle model. Any failures at this stage are likely isolated incidents rather than a systemic problem.
Buying a Used Hatchback Strut: What to Check
Since the 2025-2026 MINI Cooper is so new, any available used struts will have very low mileage, making them an excellent value. However, they will likely come from vehicles involved in collisions, so a careful inspection is essential.
- Confirm the Part Number: The verified OEM part number for the manual liftgate strut is 51-24-5-A31-C05. Ensure the part you are buying matches this number.
- Inspect for Leaks: Look for any oily or greasy film on the strut body. A working strut should be clean and dry. Any sign of fluid means the internal seals have failed.
- Check for Physical Damage: Do not buy a strut with dents on the main cylinder or a bent or scratched piston rod. Dents can prevent the piston from moving correctly, and scratches on the rod will quickly destroy the seals, causing the gas to leak out.
- Test the Pressure (If Possible): A healthy strut is very difficult to compress by hand. If you can easily push the rod into the cylinder, the strut has lost its pressure and is no longer functional. 🎬 Watch: How to test gas struts and shocks
- Verify Manual vs. Power Liftgate: Power liftgate struts have electrical connectors and wiring attached to them. The manual strut is a simple gas cylinder with no wires. The power liftgate is typically included in higher-level packages like the 'Iconic' trim. Visually confirm the part has no wiring.
Pro Tip: It is highly recommended to replace hatchback struts in pairs. Replacing only one can cause the hatch to twist slightly during operation and will put extra strain on the new strut, potentially causing it to fail prematurely.
Replacement Guide (DIY)
Replacing hatchback struts is a simple DIY task that typically takes less than 15 minutes and requires only a small flathead screwdriver.
🎬 See this quick DIY hatch strut replacement walkthrough- Difficulty: 1 out of 5
- Estimated Time: 15 minutes
- Tools Needed: Small flathead screwdriver, a friend or a prop rod (like a broom handle) to support the hatch.
Step-by-Step Instructions:
- Support the Hatch: Open the hatchback fully. Have a friend hold it open or securely prop it open with a sturdy rod. A single strut is not strong enough to hold the weight of the hatch by itself.
- Release the Upper Clip: At the top of the strut, you will see a small metal clip that secures the strut's socket to a ball stud on the car's body. Insert a small flathead screwdriver under this clip and pry it outwards slightly. You do not need to remove the clip completely.
- Remove the Upper End: With the clip loosened, pull the top of the strut away from the ball stud.
- Release the Lower Clip & Remove: Repeat the process for the clip on the lower end of the strut and remove the old strut from the vehicle.
- Install the New Strut: The new strut simply snaps into place. Align the end of the new strut with the ball stud and give it a firm push. You should hear or feel it click into place. Install both the top and bottom ends.
- Replace the Second Strut: Repeat the process on the other side of the vehicle.
- Test Operation: Remove your prop rod or have your helper let go of the hatch. Test it by closing and opening it a few times to ensure it operates smoothly and stays open correctly.
Cost Comparison
Prices for the 2025-2026 MINI Cooper hatchback strut can vary. As this is a new model, aftermarket options are not yet widely available.
| Part Type | Estimated Cost |
|---|---|
| New OEM (Dealer) | $60 - $85 per strut |
| Used OEM (Recycled) | $25 - $50 per strut |
| New Aftermarket | Not yet widely available |
| Shop Labor | $60 - $90 |
Note: Labor costs are estimated based on a 0.5-hour job at typical independent shop rates of $120-$180/hour.
Frequently Asked Questions (FAQ)
Can I replace just one hatchback strut?
It is strongly recommended to replace both struts at the same time. They wear out at a similar rate, and a new strut paired with an old one will lead to uneven pressure, twisting of the hatch, and premature failure of the new part.
How do I know if my MINI Cooper has a manual or power liftgate?
The easiest way to tell is by looking at the struts themselves. A power liftgate strut will have an electrical wire and connector attached to it, while the manual version will not. Additionally, vehicles with a power liftgate will have a button on the hatch or key fob to automatically open and close it.
Is it safe to drive with a failing hatchback strut?
While a bad strut won't stop the car from driving, it is a significant safety hazard. The hatch can fall unexpectedly when you are loading or unloading items, causing serious injury. It should be replaced as soon as possible.
How long do hatchback struts normally last?
The lifespan of a gas strut depends on usage and climate, but they typically last between 5 and 10 years before the internal pressure begins to drop.
Helpful Videos
Technical Specifications
OEM Part Numbers: 51-24-5-A31-C05 5A31C05
Pressurized gas spring for manual liftgate applications. Attaches via ball-and-socket joints secured by metal clips.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- MINI Cooper: