Parts for your 2007 Mazda Cx-9-Gas struts

2007 Mazda CX-9 Gas Struts: What They Do and When to Replace

Based on Mazda’s factory workshop manual and OEM parts catalogues, plus common aftermarket fitment guides used by technicians, the 2007 Mazda CX-9 is fitted with a pair of gas-charged struts on the rear liftgate. The bonnet is supported by a manual prop rod in most markets, so the relevant gas struts here are for the tailgate.

On the CX-9, gas struts make the hefty rear hatch easy to lift and, more importantly, hold it safely overhead. Each sealed strut is charged with nitrogen and a light oil, delivering smooth, controlled motion. When they’re healthy, the tailgate pops up with minimal effort and stays put, even in a breeze. When they’re tired, the hatch can sag, rise slowly, or drop unexpectedly — not ideal when loading the weekly shop or wrangling prams and sports gear.

These struts are considered maintenance-free, but they do live a hard life. Heat, cold snaps, dust, and constant cycling gradually reduce their gas pressure. Owners typically see 5–10 years of useful life, depending on climate and use. Because the CX-9’s hatch is large and glass-heavy, weak struts show up quickly in cooler weather or on a slight incline.

During routine servicing, it’s smart to give the gas struts a quick check: open the hatch and confirm it self-supports smoothly without creaks or bounce, look for a light oil film on the shaft (a sign the internal seal is weeping), and listen for a dry hiss or binding. If performance is borderline, replace both sides together to keep lift and balance even. Re-gassing isn’t recommended, sealed units are designed to be swapped.

Replacement is usually straightforward with basic hand tools. Support the hatch safely with a prop or a helper, pop the retaining clips at each ball joint, and click the new struts into place. Always match the OE length and force rating for the 2007 CX-9, and avoid gripping the shiny shaft with pliers — any nick will wreck the seal. A light wipe of the exposed shafts with a clean, dry cloth is all they need, don’t lubricate them.

• Replace in pairs and verify smooth, hands-off holding at full height.
• Inspect hinges and latch alignment if new struts still feel notchy.
• Expect slightly firmer lift in summer and lazier action in winter — that’s normal.

Do 2007 CX-9s have bonnet struts?

From factory, most 2007 CX-9s use a manual prop rod for the bonnet, not gas struts. Aftermarket bonnet-strut kits are available if hands-free opening is preferred, but they’re an add-on rather than original equipment.

How long should the rear liftgate struts last?

Many owners see 5–10 years depending on kilometres, climate, and how often the hatch is used. Signs they’re fading include the hatch not staying up, slow or uneven lifting, or needing a hand to reach full height — especially on cold mornings.

Can CX-9 gas struts be re-gassed, or should they be replaced?

They’re sealed units, so replacement is the proper fix. Choose quality struts matched to the 2007 CX-9’s specs and replace both together for balanced operation and safety.