Fiat 500 MOT Failures
An analysis of 5,911,757 real DVSA MOT tests on the Fiat 500 — what fails, how often, and how that compares to every other car on UK roads. Generations covered: Cinquecento (1991–2004), 312 (2007–2024).
Where the Fiat 500 fails its MOT
The single biggest MOT failure point on the Fiat 500 is body panel damage — this model is 51 times more likely to fail on this item than the average car on UK roads. That makes it a major concern for anyone buying or owning this model. Across 5,911,757 MOT tests, 0.01% of all Fiat 500 tests recorded this as a failure.
Bodywork failures usually mean structural corrosion — not cosmetic rust, but rot that affects the car's structural integrity. Check sills, subframes, and chassis rails carefully, especially on older examples.
Other notable weak points include suspension component damaged or corroded (37x the fleet average), light unit fault (27x the fleet average), cable, rod or joint insecure (23x the fleet average), and emissions failure (23x the fleet average). These ratios compare the Fiat 500's failure rate on each item against the national average for all cars tested — a ratio of 10x means this model fails ten times more often than a typical car.
The failures span 5 categories: Bodywork, Suspension, Lights & Electrics, Brakes, Exhaust & Emissions. If you're inspecting a Fiat 500 before purchase, these are the areas to focus on — and if any have been flagged as advisories on a previous MOT, they're likely to become failures in the near future.
How failures change with mileage
The Fiat 500's weak points shift as the car covers more miles. Understanding these patterns helps you know what to expect — and what to budget for — at each stage of ownership.
Under 60,000 miles
At this mileage, most failures are either design-related or caused by age rather than wear. Components like bushes and drop links may not have been replaced yet, and original-fit parts can deteriorate even on low-mileage cars that spend a lot of time sitting.
For the Fiat 500 specifically, the DVSA data shows the most common failures at this mileage are brake pipes corroded (38x the average) and suspension component damaged or corroded (37x). body panel damage (29x) and parking brake inoperative on one side (28x) also appear frequently.
60,000 to 100,000 miles
This is where routine wear items start to show up. Brake components, tyres, and exhaust parts have done serious work by this point. Cars that have been well serviced will show fewer of these failures — this mileage band is where good maintenance really separates the well-kept from the neglected.
For the Fiat 500 specifically, the DVSA data shows the most common failures at this mileage are body panel damage (48x the average) and cable, rod or joint insecure (21x). suspension component damaged or corroded (20x) and wheel bearings worn (19x) also appear frequently.
Over 100,000 miles
High-mileage cars accumulate failures across multiple systems. The key question isn't whether things will need doing — they will — but whether the car has been maintained well enough to keep on top of them. Look for a consistent service history and recent MOT passes with minimal advisories.
For the Fiat 500 specifically, the DVSA data shows the most common failures at this mileage are light unit fault (27x the average) and cable, rod or joint insecure (21x). suspension component damaged or corroded (20x) and axle or kingpin wear (18x) also appear frequently.
The shift from brake pipes corroded at lower mileages to light unit fault at higher mileages is typical — early failures tend to be design or factory-related, while high-mileage failures reflect accumulated mechanical wear. A car that's been well maintained will usually dodge the worst of both.
Known issues beyond the MOT
An MOT only tests roadworthiness at a single point in time — it won't catch developing faults, intermittent problems, or issues that haven't yet reached the failure threshold. These are the issues that Fiat 500 specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.
Subframe mounting point corrosion (312) Major
The load-bearing structure around suspension mounting points corrodes prematurely on the 312-generation 500, affecting areas within 30cm of spring and suspension attachment points. Affects 312; typical independent garage repair cost is £800–£2,000.
MultiAir actuator failure (312) Major
The MultiAir electro-hydraulic actuator controls inlet valve timing and lift on TwinAir engines. Affects 312; typical independent garage repair cost is £400–£700.
DPF blockage and regeneration issues (312) Major
The diesel particulate filter blocks on MultiJet engines used primarily for city driving. Affects 312; typical independent garage repair cost is £500–£1,000.
Timing belt service requirement (312) Major
FIRE 1.2 and T-Jet 1.4 engines use interference timing belts that must be replaced at 72,000 miles or 5 years. Affects 312; typical independent garage repair cost is £250–£400.
For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full Fiat 500 common problems breakdown.
What to check before buying a Fiat 500
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Fiat 500:
Bodywork — check for body panel damage. Suspension — check for suspension component damaged or corroded, axle or kingpin wear, abs fault, coil springs broken. Lights & Electrics — check for light unit fault. Brakes — check for cable, rod or joint insecure.
Beyond the MOT items, ask specifically about subframe mounting point corrosion and multiair actuator failure. These won't show up on a standard MOT but can be expensive to fix — repairs start from £800. A specialist pre-purchase inspection is worth the investment on this model.
Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. And verify the service history to confirm maintenance has been kept up to schedule. Enter any reg into our free car check to see the complete picture.
Looking at a specific Fiat 500?
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Fiat 500 MOT FAQs
What are the most common MOT failures on a Fiat 500?
Based on 5,911,757 DVSA MOT tests, the most common failure is body panel damage — at 51x the national fleet average. Other frequent failures include suspension component damaged or corroded and light unit fault.
Is the Fiat 500 reliable based on MOT data?
The Fiat 500 has 20 MOT failure categories above the fleet average. Specialists also flag subframe mounting point corrosion as a concern. A pre-purchase inspection and service history check are recommended.
What MOT failures should I expect at high mileage?
Above 100,000 miles, the Fiat 500 most commonly fails on light unit fault and cable, rod or joint insecure. Under 60,000 miles, the main issues are brake pipes corroded and suspension component damaged or corroded.
How do I check a Fiat 500's MOT history?
Enter the registration number into our free car check above. You'll see every MOT test result, advisories and failures, mileage readings, write-off status, and finance checks.
MOT failure data sourced from DVSA bulk test records via data.gov.uk. Ratios compare this model's failure rate against the national fleet average. Known issues sourced from manufacturer bulletins, specialist workshops, and verified owner reports.