Parts for your 2023 Mitsubishi Asx-Exhaust gasket

2023 Mitsubishi ASX Exhaust Gasket — What It Does and When to Replace It

Yes, the 2023 Mitsubishi ASX uses exhaust gaskets. Mitsubishi’s GA-series ASX/RVR/Outlander Sport service literature (Group 15 – Exhaust System and Group 11A – Engine) specifies a multi-layer steel exhaust manifold gasket between the cylinder head and manifold, and a ring/donut-style gasket at the manifold-to-front pipe joint. The Mitsubishi ASA electronic parts catalogue for GA2W/GA6W models also lists these gaskets along with flat flange gaskets further downstream. Those factory sources make it clear the ASX relies on gaskets to keep the exhaust sealed and sensors reading correctly.

The exhaust gasket’s job is simple but critical: it seals the join between metal faces that expand and contract with heat, preventing hot gas leaks, ticking noises, fumes, and false oxygen-sensor readings. On a 2023 ASX, that means quiet running, proper fuel trims, and no sooty blow-by around joints.

It’s not a routine “replace by kilometres” item, but it is a check-and-replace-when-disturbed part. Any time the manifold, catalytic front pipe, or a flange joint is removed, a new gasket should go in. Reusing a compressed or heat-cycled gasket risks leaks and warped flanges over time.

• Common locations: manifold-to-head (MLS gasket), manifold-to-front pipe (donut/ring), and rear flange joints (flat gaskets).
• Typical leak signs: a ticking sound on cold start that softens warm, exhaust smell near the engine bay, black soot at a joint, rougher idle, higher fuel use, or lean exhaust codes if the leak is ahead of the upstream O2 sensor.

When servicing, the ASX benefits from a quick visual under the bonnet and along the front pipe for soot marks, loose spring bolts, and perished gaskets. If a joint has been apart—say for a cat-back fitment, manifold work, or transmission removal—install fresh gaskets, clean the mating faces, and tighten to the service manual torque. The spring-bolt joint at the front pipe should be snugged evenly, after the first heat cycle, a recheck is wise. Genuine or OEM-quality gaskets made for the GA-series flange profiles seal best. If studs are corroded, replace them and use high-temp anti-seize on the threads (not on gasket faces).

Owners in Australia and New Zealand will see the best reliability by inspecting at regular services, acting early on any tick or smell, and avoiding reusing crushed gaskets. Done right, the ASX’s exhaust stays quiet, safe, and sensor-happy.

Popular questions about 2023 Mitsubishi ASX exhaust gaskets

Where are the exhaust gaskets on a 2023 ASX?
They sit between the cylinder head and the exhaust manifold (a multi-layer steel gasket), between the manifold and the front pipe/catalyst (a donut or ring gasket with spring bolts), and at any downstream flange joints where sections bolt together. These seals cope with heat cycling and slight movement so gases don’t leak.

How can someone tell if an exhaust gasket is leaking?
Typical clues are a sharp ticking on cold start, a whiff of exhaust in the engine bay or cabin, black soot around a joint, or a slight loss of low-end torque. If the leak is before the upstream oxygen sensor, the engine may run leaner than expected and flag a fault code.

Are exhaust gaskets a scheduled service item on the ASX?
No. They’re replaced when disturbed or when symptoms appear. Any time the manifold or front pipe is removed, a new gasket should be fitted. During routine servicing, a quick inspection for soot, loose hardware, and perished seals is smart preventative maintenance.