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, the clips are released, the old strut is popped off, and the new one is pressed on. Keep the rod end down if specified by the manufacturer to lubricate internal seals, and never twist the rod. Avoid grease or silicone on the chrome shaft—just wipe it clean with a soft, damp cloth.

Service intervals are condition‑based rather than kilometre‑based. Many sets last 5–8 years, but coastal air, dust, frequent cycling, and high ambient temperatures can shorten life. Struts are sealed units, re‑gassing generally isn’t recommended for automotive hatch applications—new, quality replacements are the reliable fix. Dispose of old units responsibly, they’re pressurised and should not be heated, punctured, or crushed.

Technical references: Toyota Service Information and Repair Manual (2016–2019 Prius, ZVW50 series) – Back Door Stay Sub‑Assembly procedures, Toyota Electronic Parts Catalog – “Stay, Back Door, RH/LH” for 2018 Prius, 2018 Prius Owner’s Manual – Back door operation and safety notes.

Popular questions about 2018 Toyota Prius gas struts

Do all 2018 Prius models have gas struts on the hatch?
Yes. All 2018 Prius hatchbacks use a pair of gas struts for the back door. Toyota documentation for the ZVW50 series identifies the “Back Door Stay Sub‑Assembly” on both sides. The bonnet uses a prop rod rather than struts.

How long do Prius hatch struts typically last in Australia and New Zealand?
Typically 5–8 years, depending on use and climate. High temperatures, coastal air, and frequent opening/closing can shorten service life. Regular checks during scheduled servicing help catch slow lift or reduced holding force before the hatch becomes a safety risk.

Can worn Prius gas struts be re‑gassed?
For most automotive hatch struts, including the Prius, re‑gassing isn’t standard practice. They’re sealed units, and consistent, long‑term results are best achieved by fitting new, quality replacements in pairs.