Fiat
1,693 MOT tests analysed. sits above the UK fleet average — here's where 500x Sports pass, fail, and end up on the retest sheet.
That's 12.2 points above the UK fleet average across our 1,984 tracked models — a confident result.
Pass
89.7%
Pass-after-fix
1.2%
Fail
9.0%
Avg miles
24,896
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 · 1,693 tests
Pass rate climbs 4.0 points across the cohorts — newer 500x Sport examples clear the test more reliably than the early cars.
Pass
87.8%
Fail
11.3%
PRS
0.7%
Avg mileage at test
28,809 mi
Pass
91.8%
Fail
6.5%
PRS
1.7%
Avg mileage at test
20,774 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.
The picture
Across 528 MOT tests, the 500x Sport returns 89.2% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a seriously damaged tyre. Tyre tread under the limit and a tyre with the cords showing round out the top three. Average tested mileage sits at 21,433, 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.
ABI Insurance Group
Below the fleet average — generally reasonable to insure. Lower groups cost less to insure; UK fleet average is around Group 22.
Source: ABI Group Rating Panel · administered by Thatcham Research · groups cover standard variants; performance trims may sit higher. Browse all insurance groups →
10–20
out of 50
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A tyre seriously damaged
20 occurrences · 1.2% of tests
Lambda coefficient outside the default limits or the range specified by the manufacturer
17 occurrences · 1.0% of tests
A tyre cords visible or damaged
17 occurrences · 1.0% of tests
A tyre seriously damaged
15 occurrences · 0.9% of tests
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
15 occurrences · 0.9% of tests
Tyre tread depth not in accordance with the requirements
15 occurrences · 0.9% of tests
Wiper blade defective
10 occurrences · 0.6% of tests
A direction indicator lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
7 occurrences · 0.4% of tests
A tyre seriously damaged
6 occurrences · 0.4% of tests
Emissions test unable to be completed
5 occurrences · 0.3% 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.
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Year-band analysis
First-time MOT pass rate split by registration band. A 4.0-point gap between bands means the year you buy Fiat 500x Sport has a real effect on what turns up at the garage.
Best band to buy
91.8%
2021+ registration
the 2021-on band climbs to 91.8% — a 4.0-point improvement. Tests in this band average 20,774 miles — roughly 8K miles fewer on the clock than the older band. Failures here are mostly wear items: has a cut in excess of the…, damaged but not adversely affecting driver's view — 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
87.8%
2018–2020 registration
On the 2018–2020 band, the data shows a 87.8% pass rate against a fleet average of 91.8% on the newer band. The main culprits logged at test: lambda reading after 2nd fast idle outside…, has ply or cords exposed, and has a cut in excess of the…. Average mileage on test for this band is 28,809 miles — high-mileage wear items are a recurring theme.
Best band to buy: 2021+ (91.8% first-time pass). Worst band to avoid: 2018-2020 (87.8% pass). That's a 4.0-point spread across 869 older tests and 824 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.
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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
The 500X has been engineered to strike the optimal balance of handling and comfort that the segment demands, while the latest active safety systems are available to assist the driver, including front headlights with DRLs; front fog lights with adaptive cornering; sophisticated ESC (Electronic Stability Control); Lane Assist (lane departure warning system) and Blind Spot Assist (lane change assistance system). A ParkView reversing camera is also available in the new 500X, as is the "Brake Control" assisted braking system.
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 500x Sport 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.
