Exhaust · 2026
Fiat 500 exhaust cost
An exhaust mid-section on a Fiat 500 typically costs £85–£307 fitted at a UK independent garage, with a full system around £186–£675. The 500's exhaust weak spot is plain corrosion — owners document rear silencers rotting within two or three winters — plus a DPF on every 1.3 MultiJet diesel that genuinely suffers in the city driving this car was built for.
Emissions hardware
The 1.3 MultiJet has carried a DPF since UK launch in 2008. Interrupted city regenerations both block the filter and dump diesel into the sump — the oil level can actually RISE, so MultiJet owners should check the dipstick regularly. The 1.0 mild hybrid's port-injected engine carries no particulate filter, so there's no regeneration to think about on the petrol side.
What's on a Fiat 500 exhaust?
Compact sectional system with a separately replaceable back-box — which is the part that goes. Documented cases include silencers barely holding together within a few winters, and Fiat's one-year exhaust warranty is a recurring owner complaint.
Fiat 500 exhaust replacement cost
A mid-section — the most common failure point — typically costs £85–£307 fitted at a UK independent garage, and a full system around £186–£675. If several sections are corroded, replacing the lot is often cheaper than doing them one MOT at a time. The catalytic converter is a separate, much pricier part.
Key things to know
- Back-box corrosion is the model's signature exhaust failure — short trips never dry the silencer out, and owners document replacements within two or three winters.
- A MultiJet that lives in town is a DPF problem waiting to happen — the documented pattern is blocked filters plus oil dilution, so regular longer runs aren't optional.
- An oil level that's gone UP on the diesel is a warning sign, not a bonus — it's unburnt fuel from interrupted regenerations.
- The TwinAir has no special exhaust quirks documented beyond the shared corrosion story — its noise is character, not a fault.
Good question
Questions Okay gets asked a lot
How much does an exhaust cost for a Fiat 500?
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Expect £85–£307 fitted for the mid-section — the most common failure point on UK cars — and around £186–£675 for a full system (cat-back) at a UK independent garage in 2026. The catalytic converter is a separate, much pricier part and isn't included in these figures. Stainless-steel systems cost more upfront but last three to four times longer than mild steel. Use our cost calculator to adjust for your region.
Why has my Fiat 500 exhaust rusted so quickly?
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It's the use pattern more than the part. A 500 typically does short urban trips — the exhaust never gets hot for long enough to boil off the moisture that condenses inside it, so the rear silencer rusts from the inside out while the outside gets salted every winter. Owners document back-boxes failing within two or three winters, some barely holding together, and Fiat's one-year exhaust warranty has been a sore point on the forums. The consolation: the back-box is a separately replaceable section, it's one of the cheaper exhaust jobs going, and a pattern-part silencer fitted at an independent garage is a perfectly sound fix on a car this age.
How do I know the exhaust is going on a Fiat 500?
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The classic signs: a deepening, louder engine note (blowing from a corroded section or failed joint), rattling over bumps (broken hangers or internal baffles), and a metallic tinkling on start-up. A sudden loud roar usually means a section has let go completely. At the MOT, a leaking exhaust is a failure and surface corrosion is a common advisory — an advisory on an exhaust section usually becomes a failure within a year, so it's worth pricing the work when the advisory appears rather than waiting.
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