Parts for your 2012 Mitsubishi Outlander-Exhaust gasket

2012 Mitsubishi Outlander exhaust gasket — what it does and when to replace it

Referencing the Mitsubishi Outlander Service Manual (2007–2013, Group 15: Exhaust System) and the Mitsubishi ASA electronic parts catalogue for 2012 CW-series models, this vehicle does use multiple exhaust gaskets. These include the exhaust manifold-to-cylinder head gasket, a ring or “doughnut” gasket at the front pipe, flange gaskets around the catalytic converter and mid/muffler sections, and (on diesel models) a turbo outlet gasket.

The exhaust gasket on a 2012 Mitsubishi Outlander is there to keep hot exhaust gases inside the system, maintain the right backpressure, protect nearby components, and make sure the oxygen sensors get accurate readings. On petrol variants, a multi-layer steel manifold gasket seals the cylinder head to the manifold, while a crush ring or doughnut gasket typically seals the manifold/front pipe joint. Further down, flat flange gaskets keep the cat, centre pipe and rear muffler connections tight. On diesel models with a turbo, there’s also a high-temp gasket between the turbo and downpipe.

There’s no fixed replacement interval. Instead, the smart play is to inspect during scheduled servicing or whenever the exhaust has been removed. If a joint is disturbed, fit a new gasket—reusing old ones often invites leaks later. Common tell-tales of a failing gasket include a ticking noise on cold start, exhaust fumes or a sharp smell under the bonnet or near the floorpan, soot marks around a joint, a rough idle, or even a sudden change in fuel economy. In NZ, any noticeable exhaust leak can cause a WOF fail