Parts for your 2011 Mazda Cx-9-Gas struts

2011 Mazda CX-9 Gas Struts — What They Do and When to Replace

Gas struts are fitted to the 2011 Mazda CX-9 on the rear liftgate, including models with and without the power tailgate. This is confirmed by Mazda’s Workshop Manual (2007–2013 CX-9, Body section: Liftgate—Liftgate Stay Removal/Installation) and the Mazda Electronic Parts Catalogue listing two liftgate “stays” (gas springs) for the TB-series CX-9. Aftermarket fitment catalogues from major OE suppliers also list dedicated gas-charged lift supports for the CX-9 rear hatch. By contrast, the bonnet on this model uses a prop rod, not gas struts, per the same manual and EPC body-front diagrams.

On the CX-9, the gas struts counterbalance the weight of the liftgate so it opens smoothly, stays put at full height, and closes without a thump. Even power-lift versions rely on these struts to assist the motor and reduce load. Good struts make everyday use easier, protect hinges and latch hardware, and help avoid injuries from a sagging or dropping tailgate—especially on hot days at the beach or cold mornings on the school run.

There’s no fixed service interval, but age, temperature swings, and dust on the shaft seals gradually reduce force. Common signs it’s time to replace include: the hatch rising slowly or only part-way, needing a helping hand to open, a sudden drop in wind, struts making squeaks or showing an oily film, and the liftgate not holding height when loaded with accessories. Because left and right struts share the load, replacement is best done in pairs.

When replacing, support the liftgate with a prop or a helper, then swap one side at a time. Choose struts specified for the 2011 CX-9 and match for power-lift or manual tailgate—force ratings differ. Clip-on ball-joint ends make the job straightforward with a small flat screwdriver. Avoid touching the chrome shafts with greasy hands, don’t compress by hand, and never drill or heat old units. For torque values and any trim removal, follow the Mazda Workshop Manual.

• Wipe the exposed shafts with a clean, dry cloth—no solvents.
• Keep cargo or bike racks balanced, extra weight can mask weak struts.
• If parked on slopes or in high wind, hold the hatch while opening and closing.

Technical references: Mazda Workshop Manual (2007–2013 CX-9, Body—Liftgate—Liftgate Stay), Mazda Electronic Parts Catalogue (TB-series CX-9, Liftgate Stay), and OE supplier fitment data for 2007–2015 CX-9 rear lift supports.

Popular questions

Does the 2011 Mazda CX-9 bonnet use gas struts?
No. The bonnet is supported by a prop rod on this model. Mazda’s body-front diagrams in the Workshop Manual and EPC show a support rod rather than a gas spring, so bonnet gas struts aren’t applicable for the 2011 CX-9.

How long do CX-9 liftgate gas struts typically last?
Anywhere from 5–10 years is normal, depending on climate and usage. Heat, cold, dust, and frequent cycling all affect lifespan. If the hatch won’t stay up or needs a push to open, it’s time for new struts—ideally in pairs.

Can CX-9 gas struts be re-gassed, or should they be replaced?
Re-gassing isn’t generally recommended for automotive hatch struts. Replacement with correctly rated units is the reliable, cost-effective fix, and it restores proper opening height and hold strength straight away.