Mitsubishi ASX Exhaust System: Specs, Fitment & Common Faults

A genuinely useful piece of context worth knowing about Mitsubishi's DPF history: DPF faults have been documented returning shortly after replacement, sometimes traced to damage caused during the repair itself.

Illustration for editorial purposes

OEM Part Numbers

Accuracy note: genuinely worth knowing: diesel ASXs with a Diesel Particulate Filter (DPF) require the DPF to be replaced or professionally cleaned as part of any exhaust work involving that section — a generic universal exhaust section without matching DPF specifications can cause the car to fail its next MOT even if it drives fine.

The Part That Announces Its Own Problems

Unlike a lot of the parts on this site, this is one where you'll usually hear the fault before you see it — a rattle, a drone, a sudden increase in noise that wasn't there last week. That's actually useful, since it gives you a head start on catching problems early.

Before you buy: exhaust configuration differs significantly by engine size, fuel type and whether your car has a particulate filter. Always confirm against your VIN before ordering.

What It Does

The exhaust system channels burnt gases away from the engine, reduces noise through the silencer, and on most modern cars, treats emissions through a catalytic converter and particulate filter before gases exit the tailpipe. Petrol and diesel versions of the same model often use entirely different systems due to different emissions treatment requirements.

Mitsubishi ASX Exhaust System reference plate

Fitment & Compatibility

Exhaust systems differ substantially between the petrol, hybrid and plug-in hybrid versions of the ASX, since the hybrid versions integrate differently with the electric motor's contribution to deceleration. Always confirm the exact part fitted to your specific engine and powertrain combination before ordering. Whether you're sourcing a replacement exhaust system for your Mitsubishi ASX from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying.

A Genuinely Useful Piece of Context Worth Knowing About Mitsubishi's DPF History

If you're cross-shopping against a diesel Outlander or L200, this is genuinely worth knowing: documented cases describe DPF faults returning shortly after replacement, in at least one case traced to technicians accidentally damaging the turbo boost pipe during the original repair work, rather than the replacement part itself being faulty. This doesn't directly affect this specific model, but is worth knowing as context if you ever face a similar recurring DPF issue.

Worth knowing generally about DPF replacement: full DPF replacement is often not actually necessary on Mitsubishi's diesel engines — simply removing the filter and cleaning it thoroughly with a jet wash can be enough to clear excess soot, worth asking about before agreeing to a full replacement.

It's also worth knowing that an EGR valve sticking open can cause excessive soot accumulation that then gets misdiagnosed as a DPF fault specifically, and that a low or empty DPF additive fluid level can trigger warning lights that look identical to a genuine filter fault.

Warning Signs, DIY Difficulty & Aftermarket Advice

These are the same regardless of make or model — see our full Exhaust System Guide for warning signs and fault codes to watch for, how difficult this job is to DIY, and which aftermarket brands are worth trusting.

More Mitsubishi Exhaust System

The same part, covered across other Mitsubishi models.