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Parts for your 2023 Mitsubishi Asx-Exhaust gasket
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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
