Parts for your 2005 Toyota Bb-Gas struts

2005 Toyota bB gas struts — what they do and when to replace

Gas struts are absolutely relevant to the 2005 Toyota bB. Technical references including the Toyota Electronic Parts Catalogue (EPC) for the NCP30/NCP31 platform list the “Stay, Back Door” as a pair of gas‑filled lift supports on the rear hatch, and Toyota’s workshop manual procedures cover removal and installation of these back door stays. The bonnet on this model typically uses a prop rod, so gas struts relate to the rear hatch rather than the bonnet.

On a 2005 bB, the gas struts take the weight of the rear hatch, help it lift smoothly, and hold it securely open. They’re pressurised with nitrogen and lightly oil‑damped, so the opening and closing feel controlled rather than jerky. That means safer loading, easier access, and no shoulder workout every time the boot’s used.

They’re sealed units with no scheduled maintenance, but as part of servicing it’s smart to check them. Wipe the chrome rod with a clean, dry cloth, don’t grease it, as that can damage the seals. Make sure the hatch opens evenly, stays up at full extension, and doesn’t shudder or drop. Cold mornings can make tired struts show their age faster.

• Hatch won’t stay up or drops unexpectedly
• Needs a big shove to lift, or opens very slowly (especially in winter)
• Visible oil weep around the rod seal
• Pitting or rust on the rod, or clunky ball‑socket ends

When replacement’s due, it’s best to do both sides together for balanced lift. Support the hatch with a prop and a helper, pop the retaining clips carefully, then swap the struts—rod down, body up—so oil keeps the top seal wet. Avoid twisting the rod, and don’t mix old and new. Quality replacements with anti‑corrosion coatings and correct end fittings make a noticeable difference. Most owners can tackle the job in under half an hour with a flat screwdriver, but if the hatch is heavy or the clips are stubborn, a workshop will sort it quickly. Expect service life to vary with use and climate, many sets last 5–10 years. Disposal should be done properly—gas struts are pressurised, so don’t pierce or crush them.

Popular questions

Do all 2005 Toyota bB models have gas struts on the bonnet?
No. The bonnet usually uses a manual prop rod. The gas struts are fitted to the rear hatch only. That’s the pair that takes the hatch weight and holds it open while loading.

Can the original gas struts be re‑gassed, or do they need replacing?
They’re designed as sealed units, so once they lose pressure or leak oil, replacement is the reliable fix. Re‑gassing isn’t commonly supported for these small automotive struts and often doesn’t last.

Is replacing the bB’s hatch struts a DIY job?
Yes, for most owners. With a helper to hold the hatch and a small flat screwdriver to release the spring clips, each side swaps over in minutes. Take care—the hatch is heavier than it looks with the struts off, and eye protection is a good idea when working near clip springs.