Symptoms of Failing Struts
- Hatch slowly drifts down while open instead of holding its position
- Hatch won't stay up at all — falls closed the moment you let go
- Hatch only stays up if you prop it or hold it
- One side holds, the other side is weak — the working strut is now carrying more than its share and will fail soon after
What the Struts Are
The rear hatch on the Gen 2 Prius is held open by two gas-pressurized lift supports — one on each side of the hatch opening. Each strut is a sealed cylinder with nitrogen gas inside that provides the upward force to hold the heavy hatch open. Over time, the seals degrade and the gas pressure bleeds off. Once that pressure is gone, the strut is just dead weight.
Each strut snaps onto a ball stud at each end — one mounted to the hatch, one to the body pillar. No bolts, no threads. The connection is a plastic snap clip that pops on and off with a flathead screwdriver.
Parts
| Option | Cost | Notes |
|---|---|---|
| QiMox aftermarket pair | ~$25–35 | Owner-tested on 2007 Prius (replaced 2021). Sold as a set of 2 — correct for one full job. Direct fit, 2004–2009 Gen 2. |
| Toyota OEM pair | ~$80–120 | Available from Toyota dealers and dealer parts sites. The original OEM struts on a 2007 lasted 14 years of South Florida ownership — OEM quality is solid, but aftermarket performs fine for this application. |
What You'll Need
- Flathead screwdriver (to pop the retaining clips)
- A helper — or a prop to hold the hatch up safely while you work
- Replacement struts (pair)
Step-by-Step
- Open the hatch fully and prop it securely. Use a broom handle or have a helper hold it. Confirm it's stable before putting your head or hands near the opening.
- Locate the struts. One on each side, running diagonally from a ball stud on the body pillar (lower mounting point) up to a ball stud on the hatch frame (upper mounting point). Each strut has a C-shaped plastic clip at each end that grips the ball stud.
- Work one strut at a time. Start at the lower mounting point (body side). Insert a flathead screwdriver between the clip and the ball stud and pry outward — the clip will pop off the stud. The end of the strut pulls free.
- Repeat at the upper mounting point (hatch side). Same technique — pry the clip off the ball stud and pull the strut end free. The old strut comes out.
- Install the new strut. Confirm orientation — the strut has a piston rod end (narrower) and a cylinder end (wider). The piston rod end typically faces upward toward the hatch. Check the new strut against the old one before snapping it in.
- Snap the lower end onto the body-side ball stud first, then snap the upper end onto the hatch-side ball stud. Press firmly until you feel and hear each end click into place. Give it a tug to confirm it's seated.
- Repeat for the other side.
- Test. Release the hatch — it should hold its position fully open. If it still drifts, check that both ends are fully seated on their ball studs.
Video Guide
Notes from the Field
The original OEM struts on my 2007 Prius lasted until 2021 — 14 years of South Florida ownership. They didn't fail dramatically; they just slowly lost the ability to hold the hatch up. The first sign was the hatch drifting down slowly over a few seconds. A few months later it would fall closed immediately if you let go.
The QiMox pair from Amazon was $30 and fit exactly. The whole job took under 20 minutes including finding a prop stick. This is one of the few repairs where there's genuinely nothing that can go wrong — the struts either snap on or they don't.
South Florida heat likely shortens the lifespan by accelerating the seal degradation that lets the gas pressure bleed out. Owners in cooler climates may get 15+ years. Either way, at $30 a pair, this is not a repair worth overthinking.