Parts for your 2008 Honda Odyssey-Exhaust gasket

2008 Honda Odyssey exhaust gasket — what it does, where it sits, and when to replace it

Referencing the Honda Odyssey (2005–2010) Service Manual’s Exhaust System procedures, the Honda Genuine Parts Catalogue, and major aftermarket application guides (Walker Exhaust and Fel‑Pro), the 2008 Honda Odyssey does use multiple exhaust gaskets. These include a multi‑layer steel manifold gasket between the cylinder head and manifold/catalyst, a spring‑joint “donut” gasket at the front pipe, and downstream flange gaskets as fitted.

On a 2008 Odyssey, the exhaust gasket’s job is simple but critical: keep hot gases sealed inside the system so the van stays quiet, safe, and efficient. At the engine end, the manifold gasket copes with serious heat and expansion, preventing that sharp ticking or chuffing noise on cold start and keeping fumes out of the engine bay. Further back, the donut and flange gaskets seal the joints between pipes so the oxygen sensors see clean, accurate readings. That means smoother running, better economy, and fewer dramas with warning lights.

There’s no set kilometre interval to swap exhaust gaskets, they’re replaced when disturbed or when they leak. Given the Odyssey’s age, any time an exhaust joint is undone—for example, to replace a catalytic converter, flex pipe, or muffler—fresh gaskets should go in. Heat cycling, corrosion, and crushed sealing faces mean reusing old gaskets is a false economy. It’s also smart to replace rusty spring bolts, nuts, and studs at the same time.

• Common signs it’s time: ticking or rasping from the front of the car, a sooty trace around a flange, exhaust odour near the cabin, or a louder note under load.
• Best practice when fitting: use OE‑spec gaskets, clean the mating faces, align the exhaust so it’s not in a bind, and tighten hardware evenly to Honda’s torque specs.

As part of routine servicing on an Aussie or Kiwi 2008 Odyssey, a quick visual check goes a long way: look for black soot at joints, listen for leaks on cold start, and inspect springs and fasteners for corrosion. If anything looks suspect, replacing the affected gasket and hardware is a straightforward, affordable fix that restores quiet and keeps the engine management happy.

One last tip: if an exhaust joint starts weeping after a big bump or kerb strike, have the hangers and flex section checked as well, movement can stress the gaskets and start a leak.

Popular questions

Where are the exhaust gaskets on a 2008 Honda Odyssey?

This model typically has a multi‑layer steel gasket between the cylinder head and the exhaust manifold/catalyst, a spring‑loaded donut gasket at the front pipe joint, and one or more flat flange gaskets further downstream depending on trim and exhaust configuration. A quick look from underneath usually reveals the donut joint (with spring bolts) and any rear flange joins.

How often should the exhaust gaskets be replaced?

They’re not a scheduled item. Replace them whenever a joint is dismantled or if there’s a leak. Given the vehicle’s age, any disturbed joint should get a fresh gasket and new hardware to avoid repeat leaks and seized fasteners later on.

Is it safe to drive with a leaking exhaust gasket?

Short trips may be possible, but it’s not ideal. Leaks can draw fumes towards the cabin, skew oxygen sensor readings, and potentially trigger performance or emissions issues. It’s better to address a leak promptly to keep the Odyssey quiet and safe.