Parts for your 2003 Toyota Bb-Gas struts

2003 Toyota bB gas struts: what they do, and how to look after them

Based on technical references including Toyota’s Electronic Parts Catalogue for the NCP30/NCP31 platform (bB) and the platform-sharing 2004 Scion xB factory service information, the 2003 Toyota bB is fitted with gas-filled stay assemblies on the rear back door (tailgate). The bonnet on this model uses a manual prop rod, not gas struts. So, gas struts are very much relevant to the rear hatch of the 2003 Toyota bB.

On a 2003 Toyota bB, the rear gas struts (often called back door stays) are the pressurised supports that take the weight of the tailgate and hold it open. They make everyday use easier and safer, stopping the hatch from slamming shut and helping it lift smoothly. Over time, seals wear and the gas charge drops, so the hatch can start to sag, open sluggishly, or refuse to stay up—especially on cold mornings.

As part of regular servicing or whenever the tailgate feels heavy, it’s worth checking the struts. Keep the shiny piston rods clean and free of grime, don’t spray them with oil or silicone, as that attracts dust and can damage the seals. If there’s any oily film weeping from the rod ends, or you hear a faint hiss and the hatch no longer holds itself up, they’re due for replacement.

Replacement is a quick, driveway-friendly job, but safety first—support the hatch with a prop or have a mate hold it. Most bB struts use simple spring clips over ball studs. Pop the clip back with a small flat screwdriver, ease the old strut off, then press the new one onto the ball until it clicks. Swap them as a pair so lift and damping stay even left-to-right.

• Typical signs they’re failing: hatch drops or won’t stay up, slow or jerky lift, worse performance in cold weather, or visible oil mist on the rod.
• Good practice: replace both sides together, verify the hatch opens fully and holds steady, and recheck after a week.

Look after the struts and they’ll look after you—no shoulder strain, no surprise head knocks, just a tidy, reliable lift every time you open the back.

FAQs

Do all 2003 Toyota bB models have gas struts on the rear hatch?
Yes. The bB (NCP30/NCP31) uses gas-filled back door stays from factory. The bonnet, however, is supported by a prop rod rather than struts.

What are the signs my bB’s tailgate struts need replacing?
If the hatch won’t stay up, droops, opens slowly or unevenly, feels heavy, gets worse in cold weather, or shows an oily film on the rods, the struts are nearing the end of their life.

Can I replace just one strut, or should I do both?
It’s best to replace both together. A mismatched pair can twist the hatch, stress the hinges, and won’t give consistent lift or hold.