Parts for your 2004 Toyota Highlander-Exhaust gasket

2004 Toyota Highlander (Kluger) Exhaust Gasket — What It Does and When to Replace It

For the 2004 Toyota Highlander (also sold as the Kluger in Australia and New Zealand), an exhaust gasket absolutely is used. Toyota’s service literature for the XU20 platform and the Toyota Electronic Parts Catalogue list multiple exhaust gaskets on both the 2.4L 2AZ‑FE and 3.3L 3MZ‑FE engines — including the exhaust manifold-to-cylinder head gasket and the sealing gaskets at the front pipe and flange joints. Aftermarket catalogues from brands like Fel‑Pro, Mahle and Walker also specify manifold and “donut” style pipe gaskets for this model, confirming fitment.

On this Highlander, the exhaust gasket’s job is to keep hot gases contained as they move from the engine through the manifold, front pipe, catalytic converter and the rest of the system. A proper seal prevents that annoying tick on cold start, stops fumes getting under the bonnet or into the cabin, and helps the oxygen sensors read cleanly so the ECU can fuel the engine right. A leaky gasket upstream can even trigger fault codes and push up fuel use.

As part of regular servicing, it’s smart to keep an ear and eye out for exhaust leaks. Common signs include a raspy or ticking noise, a whiff of exhaust near the engine bay, black sooty marks around a flange, or a Check Engine Light for mixture or catalyst efficiency. If any of that shows up on a 2004 Highlander/Kluger, plan on new gaskets rather than trying to “goop” it.

• Replace the manifold gasket any time the manifold comes off, follow the correct tightening sequence and torque from Toyota’s repair manual.
• Use the correct donut or ring gasket for spring‑bolted joints, renew the springs and bolts if they’re tired to keep clamping force even.
• Clean mating faces, remove old carbon, and avoid sealants unless the instructions for that specific gasket allow it.
• If an O2 sensor is nearby, handle with care and consider anti‑seize on the sensor threads (not on the sensor tip).
• After a heat cycle, recheck for any tell‑tale ticking or soot — early leaks are easier to sort.

Done right with quality parts, exhaust gaskets on the 2004 Highlander/Kluger will seal quietly for years, keeping the VVT‑i four or silky V6 running sweet and legal on emissions.

Popular questions about 2004 Toyota Highlander exhaust gaskets

Where are the exhaust gaskets located on a 2004 Highlander/Kluger?
They’re found at the manifold-to-cylinder head, at the manifold-to-front pipe or Y‑pipe joint (often a donut gasket with spring bolts), and at downstream flange joints near the catalytic converter and mid‑pipe. Exact count varies slightly by engine and exhaust layout.

What are the symptoms of a failing exhaust gasket on this model?
Expect a ticking or puffing sound on cold start that softens as it warms, faint exhaust smell under the bonnet or near the floor, visible soot at a joint, and sometimes a Check Engine Light from skewed O2 readings (e.g., catalyst efficiency or fuel trim codes).

Do the 2.4L and 3.3L V6 use the same exhaust gaskets?
They use the same types of gaskets (manifold, donut, flange) but the part numbers differ between engines and specific pipe setups. Always match gaskets to the engine code and build month per Toyota’s parts catalogue.