Parts for your 2019 Honda Odyssey-Exhaust gasket

2019 Honda Odyssey exhaust gasket — what it does and when to replace it

Yes, the 2019 Honda Odyssey uses exhaust gaskets. Honda’s factory Service Manual for the 2018–2020 Odyssey (J35Y-series V6) and the Honda Electronic Parts Catalogue list multiple “exhaust gaskets” across the system — including a multi‑layer steel manifold gasket at the cylinder head, crush‑ring (donut) gaskets at the front pipe/catalyst joints, and flat flange gaskets further down the pipework. Those sources also note that the crush‑type gaskets are single‑use items that should be replaced whenever disturbed.

On this Odyssey, exhaust gaskets seal hot, high‑pressure gases as they leave the engine and travel through the catalytic converters, resonator and muffler. They keep the cabin quiet, help the oxygen sensors read correctly, and stop stray leaks that can trigger fuel‑trim issues or an emissions fail. If a gasket’s crushed once and then reused, it usually won’t spring back, which is why Honda marks them as replace‑on‑removal items in the service procedures.

For servicing, it’s smart to treat exhaust gaskets as small, cheap insurance. Any time the front pipe, catalytic converter, or rear sections are dropped — say, for transmission work, engine mounts, or a muffler swap — factor new gaskets into the job along with hardware like spring bolts or studs if they’re tired. Genuine or quality aftermarket parts both do the trick, provided the fitment matches the Odyssey’s year and engine spec.

• Typical signs a gasket’s on the way out:
  • Ticking or puffing noise on cold start that lessens warm
  • Exhaust smell near the engine bay or underfloor
  • Sooty tracks at a flange or joint
  • Check Engine Light for fuel trims/O2 sensor performance
• Good workshop habits on this model:
  • Replace crush‑ring and flange gaskets whenever a joint is opened
  • Support the exhaust to avoid stressing the flex and hangers
  • Heat or penetrant on rusty fasteners