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, in Australia, it can jeopardise a roadworthy and cop a defect.

Replacement tips for the Outlander are straightforward but worth doing right:

• Pre-soak rusty fasteners and support the exhaust so it doesn’t hang on the studs.
• Use the correct style of gasket (MLS, doughnut, or flange) and new spring bolts where specified.
• Clean mating faces gently, don’t gouge them. Follow the workshop manual torque specs and, for the manifold, the proper tightening sequence.
• After the first heat cycle or a few hundred kilometres, recheck for any chuffs or soot at the joints.

For coastal or high-kilometre Outlanders, corrosion accelerates wear—so a quick look at the flanges and donut joint during each service is cheap insurance against fumes, noise, and oxygen-sensor dramas.

Popular questions

Does a 2012 Mitsubishi Outlander actually have exhaust gaskets?

Yes. Technical diagrams in the Mitsubishi Outlander Service Manual and listings in the Mitsubishi ASA parts catalogue show gaskets at the manifold-to-head, the front pipe doughnut joint, and the various flange connections. Diesel models also use a turbo-to-downpipe gasket.

How often should the exhaust gaskets be replaced on a 2012 Outlander?

They’re replaced on condition, not time. Inspect them during routine servicing, and always replace any gasket when the joint is taken apart. If there’s a leak—ticking on start-up, fumes, or soot stains—plan a replacement straight away.

Is it safe to drive with a leaking exhaust gasket?

It’s not recommended. Apart from the risk of exhaust fumes entering the cabin, a leak can skew oxygen-sensor readings and trigger other issues. Short trips to a workshop are usually fine, but it should be fixed promptly to stay safe and roadworthy.