Parts for your 2004 Toyota Highlander-Manifold gasket

2004 Toyota Highlander/Kluger manifold gasket: what it is, why it matters, and when to replace

Based on Toyota service information and parts catalogues (Toyota Technical Information System repair manuals and Toyota Electronic Parts Catalogue for the 2AZ‑FE 2.4‑litre and 3MZ‑FE 3.3‑litre engines), the 2004 Toyota Highlander—sold as Kluger in Australia and New Zealand—does use manifold gaskets. Both intake manifold gaskets and exhaust manifold gaskets are specified for this model, as also documented in major aftermarket manuals used in workshops.

The manifold gasket’s job is straightforward but critical. On the intake side, it seals the manifold to the cylinder head so only metered air enters the engine, keeping fuel trims stable and idle smooth. On the exhaust side, it keeps hot gases inside the manifold and out through the catalytic converter, taming noise, protecting nearby components, and preventing fumes sneaking into the cabin. Because these engines rely on tight sealing for proper air–fuel control, a tired gasket can cause rough running, fault codes, and extra fuel use.

As part of servicing, technicians typically inspect for vacuum leaks or soot trails before calling a gasket replacement. It’s not a set-interval item