Parts for your 2009 Toyota Mark x-Gas struts

2009 Toyota Mark X gas struts — what they do and when to replace them

Technical references confirm the 2009 Toyota Mark X is fitted with gas-charged bonnet (hood) lift supports from factory, while the boot uses torsion bars rather than gas struts. Toyota’s Electronic Parts Catalog for GRX130/GRX120 lists bonnet damper assemblies under the bonnet/hood category, and the body repair manual sections for “Hood/Bonnet” show damper-type supports. By contrast, the luggage compartment lid is shown with torsion spring hinges, not struts. So gas struts are absolutely relevant on this model—but at the bonnet, not the boot.

On the Mark X, the bonnet gas struts take the grunt out of lifting and hold the bonnet steady while servicing. They’re nitrogen-charged dampers that provide smooth, controlled opening and stop the bonnet from slamming shut. Over time, seals can wear and gas pressure can drop, especially in colder weather, leading to a bonnet that’s heavy to lift or slowly sags—never ideal when hands are under the bonnet.

For servicing, it’s smart practice to check strut performance at each service interval. A healthy pair should lift progressively and hold the bonnet at full extension without drift. If there’s oil film around the rod, reduced lift, or creaking at the ball sockets, replacement is due. Because they work as a pair, replacing both sides together keeps lift and balance even.

When fitting new units, support the bonnet with a prop or a mate, then swap one side at a time. Keep the rod end pointing down in service (as designed) to keep the internal seal lubricated. Don’t clamp the shiny rod with pliers and don’t apply grease to the rod—just wipe it clean with a soft cloth. A tiny dab of suitable lubricant on the ball studs (not the rod) can quieten a dry socket. Always secure the retaining clips fully and tighten fasteners to the workshop manual spec.

• Common signs they’re tired:
  • Bonnet won’t stay up or drops in a breeze
  • Slow or jerky lift, worse in cold mornings
  • Visible oil weep on the shaft
• Good practice:
  • Replace in pairs every 5–10 years, or at first sign of sag
  • Inspect hinge play and ball studs while you’re there
  • Dispose of old struts safely—pressurised units shouldn’t be pierced or burnt

For the boot on this model, performance issues are usually due to torsion bar adjustment or hinge friction, not failed gas struts.

Popular questions about 2009 Toyota Mark X gas struts

Does a 2009 Toyota Mark X have gas struts on the bonnet or the boot?
Yes—factory bonnet gas struts, the boot uses torsion bars. This layout is shown in Toyota’s parts listings for GRX130/GRX120 (bonnet damper assemblies) and body sections for the luggage lid (torsion springs rather than dampers). If the boot feels heavy, it’s typically a torsion bar or hinge issue, not a failed gas strut.

How long do Mark X bonnet struts usually last?
Service life varies with climate and use, but many owners see 5–10 years. Colder temps and frequent opening shorten life. If the bonnet won’t hold itself up, or rises sluggishly, the struts have likely lost charge and should be replaced in pairs during the next service.

Can boot gas struts be added to a 2009 Mark X?
It’s not a straightforward retrofit. The boot is engineered around torsion bars and doesn’t provide factory mounts for struts. Custom brackets and revised hinges would be required and can stress the panel. Keeping the torsion system adjusted and hinges lubricated is the sensible route.