Parts for your 1999 Toyota Avensis-Gas struts

1999 Toyota Avensis Gas Struts — What They Do and When to Replace Them

Based on technical references — including the Toyota Electronic Parts Catalogue (EPC) for the T22 Avensis, the Haynes Toyota Avensis 1998–2003 Service and Repair Manual, and aftermarket catalogues such as Stabilus Lift-O-Mat and Monroe Max-Lift — gas struts are factory-fit on the tailgate of 1999 Avensis Liftback and Estate models. The Saloon’s boot lid generally uses torsion bars rather than gas struts, and the bonnet on most variants uses a manual prop rod rather than bonnet struts. So, for 1999 Avensis Liftback and Estate owners, gas struts are absolutely relevant parts of routine servicing.

On the Avensis Liftback and Estate, the tailgate gas struts (also called gas springs) hold the tailgate up and help it lift smoothly. They’re nitrogen-charged and sealed, delivering consistent support without needing regular adjustment. When they’re healthy, the tailgate opens with minimal effort and stays put — even in a stiff Wellington southerly or a warm Perth arvo.

Over time, seals wear and pressure drops. That shows up as a tailgate that rises slowly, won’t stay up, or drops unexpectedly — especially on cold mornings. Any oily film on the strut body, binding through the stroke, or needing two hands to lift the tailgate are classic signs it’s time to replace. Most workshops recommend replacing struts in pairs to keep lift and balance even.

Replacement is a straightforward job for a competent DIYer or a quick workshop task. The key is safety: always support the tailgate with a prop or a mate before releasing the clips. Small circlips or spring clips are gently pried back with a flat screwdriver