Fiat Dethleffs
Reliability, estimated running costs, and MOT data across 4 model years from 327 MOT tests in 2024.
Avg Pass Rate
90%
Total Tests
327
Highest Pass Rate
2018 (94%)
Years Covered
4
About the Fiat Dethleffs
The Fiat Dethleffs was MOT tested 327 times in 2024 (DVSA data, retests included) across 4 model years (2017 to 2020), with an average pass rate of 90%. That's comfortably above the average of 82% across all models in our data. Our records list diesel versions.
Best and Worst Years
Of the years with at least 100 tests, the 2018 model has the highest pass rate at 94% from 118 tests. The 2019 model has the lowest at 89%. With just a 5 point gap, pass rates are similar across these years. Newer cars usually pass more often simply because they are younger.
Mileage Across Years
The oldest model in our data (2017) averages 19,963 miles, while the newest (2020) averages 13,034 miles.
Compared to the Fiat brand average of 83%, the Dethleffs performs 7 points better, making it one of the more reliable options in the Fiat range.
Estimated Running Costs
Based on 7,400 miles/year, average pump prices of 174.57p petrol and 199.33p diesel (GOV.UK weekly road fuel prices, week of 19 October 2026), and MOT pass rate data. Insurance not included.
Full 2020 detailsHow reliable is the Fiat Dethleffs?
Fiat Dethleffs by Year
Click any year to see detailed running costs, reliability data, and comparisons with similar cars.
Questions about the Fiat Dethleffs
Is the Fiat Dethleffs reliable?
Across its 4 model years in our data (2017 to 2020), the Fiat Dethleffs averages a 90% MOT pass rate, from 327 tests (DVSA MOT data for tests in 2024, retests included). That's 8 points above the average of 82% across all models in the same data. The 2018 model has the highest pass rate of the years with at least 100 tests, at 94%.
Which year Fiat Dethleffs has the best MOT pass rate?
Of the years with at least 100 tests, the 2018 Fiat Dethleffs has the highest MOT pass rate at 94%, while the 2019 model has the lowest at 89%, a 5 point gap. Newer cars usually pass more often simply because they are younger, so compare years of a similar age.
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