Plateop European Inspection Index 2026-09: periodic vehicle inspection failure index per car model and age group (Netherlands, United Kingdom, Czechia)

Comparable inspection failure index per car model and age group across three European countries, built from open government inspection data. Index 100 = national average of that age group; 150 = one and a half times the national failure rate. 976 model and age group cells, 329 with a European index. Countries define "failed" differently: the Dutch APK counts any real defect, the British MOT counts the initial failure before retest, the Czech STK counts only serious and dangerous defects (grades B and C). Raw percentages are therefore not comparable across borders. This dataset expresses each model as a ratio to its own national average for the same age group (index = model failure share / national failure share x 100) and combines countries into a test-weighted European index only when a model has at least two countries and 5,000 tests. Sources: RDW open inspection data (Netherlands, rolling window 2023-08-26 to 2026-08-18), DVSA MOT test results (United Kingdom, test year 2025), Czech STK inspection data (Ministry of Transport, 2025). A national index requires at least 1,500 tests of the model in that age group. Editions are frozen: this file never changes after publication, so cited figures stay verifiable. Columns (CSV): editie, band (age group in years), merk, model, land (nl, uk, cz), bron, keuringen (tests), met_afkeur (tests with a failure, country definition), aandeel, vloot_aandeel (national failure share for the age group), landindex (round(aandeel / vloot_aandeel x 100)), europese_index (test-weighted average of national indexes, empty below the thresholds), europese_landen, europese_keuringen. The JSON file carries the same data plus per-country baselines and top lists; README.md documents the method. Method page: https://uk.plateop.com/pers/keuringsindex/2026-09 (English) and https://nederland.plateop.com/pers/keuringsindex/2026-09 (Dutch). Attribution: Plateop European Inspection Index, edition 2026-09. Contact: Jon Mase, Plateop, [e-mail].