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
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.
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.
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.
Common Faults
Symptoms of Failure
- Rattling noise, especially on startup — often a loose or corroded heat shield rather than the exhaust pipe itself, though worth checking both.
- Noticeably louder engine noise — points to a hole or split somewhere in the pipe or silencer, typically caused by corrosion.
- Visible rust or flaking on the underside — a warning sign of corrosion that will eventually lead to a leak if left unaddressed.
- Failed emissions test — can point to a failing catalytic converter or particulate filter rather than the pipework itself.
DIY Replacement Difficulty
Replacing a full exhaust system is a moderate-to-difficult DIY job requiring access to raise the car safely and often penetrating oil to free corroded fixings. Catalytic converter and particulate filter replacement usually requires specific diagnostic equipment afterward to reset fault codes, making that portion of the job better suited to a garage. Expect 2–4 hours for a full system on a home ramp, or less at a garage with the right lift access.
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.
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.
OEM vs. Aftermarket
Reputable aftermarket exhaust systems are widely regarded as a safe, cost-effective alternative to OEM parts for the pipework and silencer sections. Catalytic converters and particulate filters are worth sourcing from well-regarded brands specifically, since counterfeit or substandard versions are a common cause of failed emissions tests and check-engine warnings.
More Mitsubishi Exhaust System Guides
The same part, covered across other Mitsubishi models.