Fiat
2,054 MOT tests analysed. sits above the UK fleet average — here's where 500 Sport Mhevs pass, fail, and end up on the retest sheet.
That's 11.3 points above the UK fleet average across our 1,984 tracked models — a confident result.
Pass
88.8%
Pass-after-fix
2.8%
Fail
7.9%
Avg miles
19,709
Pass + Pass-after-fix + Fail = 100%
Petrol cars first registered from January 2006 meet Euro 4 — compliant in London ULEZ, Birmingham CAZ, Bristol CAZ, and Glasgow LEZ.
Performance by cohort
2 year bands · 2,054 tests
Pass rate climbs 3.5 points across the cohorts — newer 500 Sport Mhev examples clear the test more reliably than the early cars.
Pass
86.2%
Fail
10.2%
PRS
3.1%
Avg mileage at test
23,464 mi
Pass
89.7%
Fail
7.1%
PRS
2.7%
Avg mileage at test
18,433 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.
The picture
Across 2,054 MOT tests, the 500 Sport Mhev returns 88.8% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a tyre with the cords showing. A defective wiper blade and tyre tread under the limit round out the top three. Average tested mileage sits at 19,709, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.
Filter failures:
Hide categories
Tick a category to hide it from rankings sitewide. Saved in this browser only.
A tyre cords visible or damaged
72 occurrences · 3.5% of tests
Wiper blade defective
32 occurrences · 1.6% of tests
Tyre tread depth not in accordance with the requirements
27 occurrences · 1.3% of tests
A tyre seriously damaged
16 occurrences · 0.8% of tests
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
14 occurrences · 0.7% of tests
Wiper blade missing or obviously not clearing the windscreen
9 occurrences · 0.4% of tests
Cable damaged or knotted
6 occurrences · 0.3% of tests
A tyre seriously damaged
5 occurrences · 0.2% of tests
Brake disc or drum significantly and obviously worn
4 occurrences · 0.2% of tests
A tyre pressure monitoring system malfunctioning or obviously inoperative
4 occurrences · 0.2% of tests
Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.
Worst-case fix budget · top 3 failures
£140–£235
If every one of this 500 Sport Mhev's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →
Try the calculator
Build your own retest budget.
Year-band analysis
First-time MOT pass rate split by registration band. A 3.5-point gap between bands means the year you buy Fiat 500 Sport Mhev has a real effect on what turns up at the garage.
Best band to buy
89.7%
2021+ registration
the 2021-on band climbs to 89.7% — a 3.5-point improvement. Tests in this band average 18,433 miles — roughly 5K miles fewer on the clock than the older band. Failures here are mostly wear items: has ply or cords exposed, blade defective — the structural issues that drag down older examples don't appear in the top-10 for this band. Post-2020 examples are early in their MOT life and generally show the cleanest records.
Band to be cautious about
86.2%
2018–2020 registration
On the 2018–2020 band, the data shows a 86.2% pass rate against a fleet average of 89.7% on the newer band. The main culprits logged at test: has ply or cords exposed, tread depth below requirements of 1.6mm, and has a cut in excess of the…. Average mileage on test for this band is 23,464 miles — high-mileage wear items are a recurring theme.
Best band to buy: 2021+ (89.7% first-time pass). Worst band to avoid: 2018-2020 (86.2% pass). That's a 3.5-point spread across 522 older tests and 1,532 newer ones — year of build makes a material difference on this model.
Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.
Item 01 · Amazon UK
Digital tyre-tread depth gauge
Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.
Search Amazon UK
Item 02 · Amazon UK
Bosch Aerotwin wiper blades
Cheap wipers fail the test on smear streaks. Bosch Aerotwins last a winter and clear a screen properly.
Search Amazon UK
My Motor World · affiliate
Affiliate links — small commission, no extra cost to you.
Hycote
Hycote Touch Up Colour Paint Brush Fiat Broom Yellow 12.5ml
£6.59
View at My Motor World →
Hycote
Hycote Fiat Capri Blue Double Acrylic Spray Paint 150ml
£6.59
View at My Motor World →
Hycote
Hycote Fiat Black Double Acrylic Spray Paint 150ml
£6.59
View at My Motor World →
Hycote
Hycote Fiat Red Orange Double Acrylic Spray Paint 150ml
£6.59
View at My Motor World →
Click Mechanic · affiliate
Affiliate links — small commission, no extra cost to you.
Mobile mechanic · UK-wide
Book a mechanic at your door.
Fixed-price quotes upfront. No garage needed. Click Mechanic sends a vetted local mechanic to you — home, work, or roadside.
Owner reports · Honest John
Verbatim faults logged by owners on honestjohn.co.uk over recent years. We didn't summarise — these are the words people typed in.
What's good
Not very practical. Bouncy ride. Sluggish performance. In-car tech is behind the times.
Another case of hatchback lock failing because cables inside wiring loom had chafed in the hatchback hinge. All 500 owners should check for this.
Software fix available from some Fiat dealers that restores the performance of EU6 1.2 Panda and 500 engines.
Fiat 500 Dualogic would not select any gears and required new Actuator at a cost of £1800. Cost of repairs so far: £3,000.
Problem with EU6 compliant versions of 1.2 Fire engine in Fiat 500. Hesitation when pulling away in 1st and 2nd gears due to a ECU remapping to meet EU6. "Feels very unsafe, when trying to pull out into traffic."Apparently, some Fiat dealers have an ECU software fix for this. At a guess, it is probably to resture the ECU to the EU5 settings.
Another case of a 500 MultiJet diesel engine revving uncontrollably because the ECU had introduced too much fuel to the engine to actively regenerate the DPF, this fuel had sunk into the sump, and the sump level had risen sufficiently for the compression ignition engine to run on it. This car was a 25,000 mile 2008 500 MultiJet. Vital for all drivers of 500 MultiJet diesels to chack their sump levels regularly and if the oil seems to rise get their cars to a Fiat dealership for an oil change and forced regeneration of the DPF.
Second report of failed rear wiper and brake lights on a 4-year old 500 due to can bus wiring problems as a result of the cable loom getting trapped in the hatchback opening £400 to fix.
A 2010 Abarth 500 suffered the loss of various key functions including speedometer, indicators and brake lights (which of course makes the car illegal to drive). An independent garage traced the fault to the wiring cable under the tailgate. The wires had become twisted and broken as a result of the movement of the tailgate. Fault as origninally reported on 13-5-2012.
Heater matrix failure on 500 TwinAir led to overheating of engine.
Electric hatch lock failed twice on a 17,500 mile 2009/50 500: first time replaced under warranty; 2nd time dealer wanted £193.
Clutch mechanism of 2009/59 500 and electric hatchback lock failed at very low 2500 miles.
Yet another failed 1.3 Multijet reported. This was a 2008/58 that had done less than 14,000 miles. Active DPF regeneration had put too much diesel into the engine, effectively raising the sump level and causing the engine to run uncontrollably on its sump oil to the point of self-destruction. Vital for all drivers of 500 Multijet diesels to chack their sump levels regularly and if the oil seems to rise get their cars to a Fiat dealership for an oil change and forced regeneration of the DPF.
PAS failure on 20 month old 500C**.**
Source: honestjohn.co.uk · 29 reports indexed, top 12 shown
Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.
If you own a 500 Sport Mhev and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.
