Parts for your 2015 Toyota Bb-Gas struts

2015 Toyota bB gas struts — what they do and when to replace them

Technical references confirm gas struts are fitted to the 2015 Toyota bB’s rear hatch. Toyota’s Electronic Parts Catalogue for the QNC20/QNC21 series (2005–2016) lists a “Back Door Stay” (gas spring) for this model, and Toyota repair procedures cover removal/installation of the back door damper. Major catalogues that mirror OE listings also carry rear hatch gas springs for the 2015 bB. From factory, the bonnet is held up by a prop rod rather than struts, so the relevant gas struts on this vehicle are for the tailgate/hatch.

On this bB, the rear gas struts take the weight of the hatch and control its movement so it opens smoothly and stays put without sagging. They’re nitrogen-charged, sealed units designed to deliver steady support across temperatures, but like any wear part they gradually lose pressure. Cold mornings, high use, and dust or salt exposure can speed that along. When they’re healthy, one hand lifts the hatch and it glides up, when they’re tired, it feels heavy or droops, which is both annoying and unsafe.

There’s no set kilometre-based interval for replacement, but struts typically last five to ten years. On a 2015 bB, many originals are now due. Replace in pairs so lift and balance match, and always support the hatch with a prop or helper while you swap them. Quality OE-equivalent struts arrive pre-charged with the correct Newton rating for this model—don’t guess the force. Fresh ball studs or clips are cheap insurance if the originals show wear.

• Signs they’re done: hatch won’t hold itself up, slow or jerky action, creaking at the pivots, oil mist on the shaft.
• Service tips: keep the chrome shafts clean and dry, don’t grease the shafts (it attracts grit), a light mist of silicone on the pivot balls is fine.
• Safety: treat struts as pressurised cylinders—don’t heat, puncture, or crush. Dispose of old units responsibly.

Whether it’s a tidy daily or a weekend runabout, a fresh pair of rear hatch struts keeps the bB feeling modern and user-friendly. It also protects the latch and hinges by reducing slam loads, especially when it’s windy.

Popular questions about 2015 Toyota bB gas struts

Does the 2015 Toyota bB have gas struts on the bonnet?
From factory, no—the bonnet uses a prop rod. The gas struts on this model are for the rear hatch. Aftermarket bonnet-strut kits exist, but they’re not OE equipment and need brackets matched to the bB’s mounting points.

How can someone tell the hatch struts need replacing?
If the hatch won’t stay up, drops in cold weather, or rises slowly and unevenly, the struts are weak. A quick test is to open the hatch halfway and see if it holds position. Any sagging, or needing a shoulder to keep it up, means it’s time for new ones—replace both sides together.

Can the original struts be re-gassed, or should they just be replaced?
Most bB hatch struts are sealed units and aren’t designed for re-gassing. In Australia and New Zealand, replacement with new, correctly rated struts is the common, cost-effective fix. Be sure the force rating and end fittings match the bB’s specs.