Parts for your 2006 Toyota Highlander-Exhaust gasket

2006 Toyota Highlander (Kluger) Exhaust Gasket — Purpose, fitment and service tips

Yes, an exhaust gasket is fitted to the 2006 Toyota Highlander (also sold as the Kluger). Technical sources such as the Toyota Repair Manual for ACU2#/MCU2# models and the Toyota Electronic Parts Catalog specify multiple exhaust gaskets on this vehicle, including the exhaust manifold-to-cylinder head gasket and the “gasket, exhaust pipe” (donut/flange gaskets) at the front pipe, catalytic converter and muffler joints. Those factory procedures also call for gasket replacement any time these joints are disturbed.

On this Highlander, the exhaust gasket’s job is simple but critical: it seals the high‑temperature, high‑pressure exhaust gases so they flow cleanly through the catalytic converters and out the tailpipe without leaks. That keeps the cabin quiet, emissions in check and the oxygen sensors reading accurately. The 2.4L 2AZ‑FE and the 3.3L 3MZ‑FE variants both use a metal multi‑layer exhaust manifold gasket, and crush-style ring (donut) or flat flange gaskets at pipe joins further downstream.

When servicing, it’s smart to treat exhaust gaskets as single‑use parts. Once crushed and heat‑cycled, they don’t reseal reliably. Any time the manifold, front pipe, catalytic converter or rear section is removed, new gaskets should be fitted to avoid leaks and comebacks. A technician will also inspect mating surfaces for pitting or warping and clean off old residue so the new gasket beds in properly.

Tell‑tale signs it’s time for attention include:

• A ticking sound on cold start that quietens as it warms
• Exhaust odour near the engine bay or underbody
• Sooty marks around flanges or the manifold
• Poor fuel economy or OBD faults from skewed O2 readings

For DIYers, soak rusty studs and nuts with penetrant and use new hardware where specified, heat and age can make fasteners brittle. Torque settings matter, especially on the manifold — over‑tightening can distort flanges or snap studs. Workshops will typically recommend genuine or quality aftermarket gaskets rated for the Highlander/Kluger’s operating temps to ensure longevity.

As part of routine servicing, a quick visual and audible check goes a long way: look for soot trails at joints, listen for sharp ticks, and keep an eye on fuel trims if scanning. If a leak is suspected, booking the Highlander in promptly protects the catalytic converters, keeps it quiet on the motorway and maintains compliance with Aussie and Kiwi emissions standards.

Popular questions about 2006 Toyota Highlander exhaust gaskets

Where are the exhaust gaskets located on a 2006 Highlander/Kluger?
They’re at the exhaust manifold-to-cylinder head and at key pipe joins: typically the manifold outlet to front pipe, around the catalytic converter flanges, and sometimes at the rear muffler join. Both the 2.4L and 3.3L layouts use a combination of multi‑layer metal and crush‑ring (donut) gaskets.

What are the symptoms of a leaking exhaust gasket?
Common signs include a ticking noise on start‑up, exhaust smell under the bonnet or beneath the car, visible black soot at a flange, and in some cases fault codes or rough running due to false O2 readings. Leaks upstream of the sensors are the most noticeable.

Do exhaust gaskets need periodic replacement, and what might it cost?
They’re not a km‑based service item, but they should be replaced whenever the joint is disturbed or a leak is detected. Gaskets are generally inexpensive, while labour varies with access — from a quick front‑pipe reseal to more time‑consuming manifold work if studs are seized.