Ford Fiesta: diesel vs petrol MOT pass rates
Last updated · OBDCode UK editorial
Ford Fiesta petrol MOT tests (PE, 3,459,359 tests) passed 73.8% (95% CI 73.7–73.8) and diesel MOT tests (DI, 537,794 tests) passed 64.0% (95% CI 63.9–64.2). Compiled by OBDCode UK, edition 2026.1. These are not official statistics and not a DVSA or DVLA statistic. Contains public sector information licensed under the Open Government Licence v3.0.
73.8% petrol; 64.0% diesel; 2023–2025; edition 2026.1.
Petrol and diesel
Scroll horizontally to read every fuel column.
| Fuel | Tests | Pass rate |
|---|---|---|
| Petrol | 3,459,359 | 73.8% (95% CI 73.7–73.8) |
| Diesel | 537,794 | 64.0% (95% CI 63.9–64.2) |
How to read the fuel comparison
This page compares petrol and diesel first-test pass rates for the Ford Fiesta. Petrol is 73.8% from 3,459,359 tests. Diesel is 64.0% from 537,794 tests. The gap is +9.7 points. Do not average the two fuels into one rate.
Why this page prints no price
This page prints no repair price because labour rates, parts and the exact defect vary by car and by area. A figure that fitted one quote would be wrong for most readers. Ask a garage for a written quote against the certificate wording.
Driving after a failed test
A failed MOT does not by itself tell you whether the car may be driven. The rule depends on whether the car is still roadworthy and whether a previous certificate is still in date. Read https://www.gov.uk/check-mot-history for the current rule. This page does not decide your legal position.
What MOT data cannot tell you
MOT data is an annual snapshot of what a tester could see on the day, not a reliability survey. It does not record how a car drives between tests, or what was repaired the week before. It cannot tell you whether your Ford Fiesta is about to fail.
Where these figures come from
We compile these figures from anonymised MOT test records released as public sector information. They are licensed under the Open Government Licence. The source extract is linked at https://www.data.gov.uk/dataset/c63fca52-ae4c-4b75-bab5-8b4735e1a4c9/anonymised-mot-tests-and-results. These counts are not an official statistic.
Source: DVSA Anonymised MOT tests and results, 2023–2025 extracts (Class 4). Grain: test records. Contains public sector information licensed under the Open Government Licence v3.0.