Parts for your 2019 Mitsubishi Outlander-Exhaust gasket

2019 Mitsubishi Outlander exhaust gasket — what it does and when to replace it

Technical sources confirm the 2019 Mitsubishi Outlander does use exhaust gaskets. The Mitsubishi Motors service manual (Intake and Exhaust/Exhaust System sections for 2019 model year) specifies an exhaust manifold gasket at the cylinder head and sealing ring “donut” gaskets at pipe joints. The Mitsubishi ASA electronic parts catalogue (EPC) also lists these gaskets across the 2.4L petrol, 3.0L V6, and PHEV variants, along with crush-ring gaskets for the front pipe-to-catalyst and mid-pipe connections. So, yes—exhaust gaskets are absolutely fitted on this model.

The exhaust gasket’s job is to keep hot gases sealed inside the system from the moment they leave the engine. At the manifold, a multi-layer steel gasket prevents leaks that can cause a ticking noise on cold start, fumes under the bonnet, and skewed oxygen sensor readings. Further down, metal ring “donut” gaskets and flat flange gaskets maintain a gas-tight seal at slip joints and flanges while allowing for movement from heat and vibration. A sound seal helps maintain proper back pressure, keeps the Outlander quiet, and protects occupants from exhaust fumes.

Exhaust gaskets aren’t a routine replacement item by time or kilometres, they’re replaced when there’s a leak or whenever a joint is disturbed during other repairs. As part of servicing, it’s smart to:

• Listen for ticking or hissing at cold start, especially near the manifold.
• Look for sooty deposits around joints and flanges.
• Note any exhaust smell in the cabin or under the bonnet.
• Check spring bolts and studs for corrosion or looseness.

If a gasket needs replacing, best practice is to use a quality OEM or equivalent part, renew any spring bolts and nuts, and clean mating surfaces carefully. Avoid sealants on multi-layer steel or donut gaskets unless the factory manual explicitly calls for it. Align flanges evenly and torque fasteners to the factory spec to prevent warping or repeat leaks. On higher‑kilometre Outlanders, it’s wise to replace aged studs and hardware while you’re there, as heat cycles can make them brittle.

Ignoring a leak can lead to noisy operation, potential carbon monoxide ingress, and incorrect fuel trims. A quick, correct gasket replacement restores quiet running and keeps the Outlander compliant with emissions and WOF/rego expectations.

• Does the 2019 Outlander have more than one exhaust gasket?
  Yes. There’s typically an exhaust manifold gasket at the head and one or more ring/flat gaskets at front and mid-pipe joints. Exact count depends on engine and whether it’s a PHEV, but the service manual and EPC list multiple seals along the system.
• How often should exhaust gaskets be replaced?
  They’re replaced when leaking or whenever a joint is separated for other work. There’s no fixed interval—inspect during services and renew if there’s noise, soot marks, or a smell.
• Is it safe to drive with a leaking exhaust gasket?
  It’s not recommended. Leaks can allow fumes near the cabin and can upset oxygen sensor readings, leading to poor fuel economy. Short trips to a workshop might be okay, but plan prompt repair.