Parts for your 2007 Mitsubishi Outlander-Exhaust gasket

2007 Mitsubishi Outlander exhaust gasket — what it is and when to replace it

Based on Mitsubishi’s 2007 Outlander workshop manual (engine and exhaust sections) and parts catalogues such as Mitsubishi ASA/CAPS and common aftermarket listings, the 2007 Mitsubishi Outlander does use exhaust gaskets — including manifold-to-cylinder-head gaskets and ring/donut gaskets at key flange joints in the exhaust system.

On this Outlander, the exhaust gasket’s job is simple but critical: it seals the joints where hot exhaust gases leave the engine and flow through the headers/manifolds, catalytic converter and pipework to the rear. A healthy gasket prevents leaks that rob power, upset oxygen sensor readings and let fumes and noise escape under the bonnet or beneath the cabin.

As part of regular servicing, it’s smart to check for exhaust leaks every 10,000–15,000 km or at each service. Tell-tale signs include a ticking sound on cold start, a sharp puffing under light throttle, a whiff of exhaust near the front of the car, or sooty marks around a flange. On the Outlander, a leak up front can trigger a check engine light because the O2 sensors pick up funny readings when unmetered air sneaks in.

Any time the exhaust is disturbed — say, removing the manifold, dropping the front pipe, or replacing the cat — new gaskets should go in. Re-using old ones is a false economy, once crushed and heat-cycled, they rarely reseal well. The mating faces should be clean and flat, studs and nuts inspected, and hardware replaced if corroded. For this Mitsubishi, torque settings should follow the factory spec in the service manual, and it’s wise to fit new spring bolts on donut-jointed flanges to maintain clamp load as things expand and contract with heat.

A quality gasket pays its way. It helps keep the Outlander quiet and smooth, protects against carbon monoxide entering the cabin, and keeps it onside for WOF or roadworthy checks. If there’s a leak, don’t leave it too long — minor flange leaks can usually be sorted in an hour or two, while manifold gaskets can take longer due to access and the odd stubborn stud. Using OEM-equivalent or premium aftermarket gaskets is recommended, avoid sealants on manifold-to-head joints unless the manual explicitly allows it, and only use high-temp sealant where the manufacturer specifies.

• Common symptoms: ticking on cold start, exhaust odour near the front, visible soot at a joint, louder-than-normal note, or a check engine light.

Popular questions

Where are the exhaust gaskets on a 2007 Outlander?
They’re found at the exhaust manifold-to-cylinder head, and at key flanged joints (often with a crush “donut” ring) between the manifold/front pipe, catalytic converter and mid-pipe. Rear sections may also use flat gaskets at flanges.

Is it safe to drive with a leaking exhaust gasket?
Short trips might seem fine, but it’s not a great idea. Leaks can allow exhaust into the cabin, raise noise, reduce performance and trigger fault codes. It may also cause a fail at WOF/roadworthy. Best to fix promptly.

Do exhaust gaskets need routine replacement?
They’re not a fixed-interval item, but they should be replaced whenever the joint is separated or a leak is suspected. During regular services, ask for a quick inspection for soot marks, noise and odour around the joints.