Parts for your 2018 Toyota Prius-Gas struts

2018 Toyota Prius gas struts — fitted, purpose, and servicing tips

Gas struts are fitted to the rear hatch of the 2018 Toyota Prius (ZVW50 series). This is confirmed by Toyota’s Service Information and Repair Manual for the 2016–2019 Prius (section: Back Door – Back Door Stay Sub‑Assembly) and the Toyota Electronic Parts Catalog, which lists the “Stay, Back Door, RH/LH” for this model. The owner’s manual also illustrates the back door supported by stays. The bonnet on this Prius uses a prop rod rather than struts, but the hatch relies on a matched pair of gas-charged struts to lift and hold safely.

On a 2018 Prius, the gas struts counterbalance the hatch weight, making it easy to open and preventing it from dropping unexpectedly. They’re sealed, nitrogen‑charged dampers with oil for smooth, controlled motion. Properly working struts improve day‑to‑day usability and reduce strain on hinges and latch components.

These struts are essentially maintenance‑free, but periodic checks during regular servicing are smart, especially in Australian and New Zealand conditions where heat and UV can accelerate wear. Look for:

• Slower hatch lift, especially noticeable in cold weather
• Hatch failing to stay fully open or drifting down
• Oil misting or wetness on the strut shaft or body
• Clicks, binding, or uneven extension

When replacement is due, it’s best practice to replace both sides together to maintain balanced support. Always support the hatch securely with a prop or a second person before removing any strut. The Prius uses ball‑stud sockets