Across the 4 registration years we hold, the Mercedes-Benz C-Class sat 428,714 MOT tests and passed first time 83.1% of the time, above the 80.5% national average for cars aged 3 to 8. The strongest year is the 2018 at 86.5%, the weakest the 2015 at 80.3%. Pick a year for the full record, or check a specific reg.
Best year to buy. On this data the 2018 C-Class is the strongest at 86.5%, 6.2 points clear of the 2015. The newer registrations pass more often, a 6.2-point swing from 2015 to 2018 that usually marks a facelift or new generation.
Reliability by registration year
What fails across the range
Brakes25.4%
Emissions & leaks2.5%
Lights & electrics1.9%
Body & structure1.2%
Wheels1%
Share of tests flagging each component, averaged across every C-Class year, weighted by test volume.
First-time MOT pass rate · DVSA bulk data · 2022-2024 · class 4 cars · updated 2026-07-07