# Mercedes-Benz 300 MOT reliability: pass rate and common failures | RegFlags

The Mercedes-Benz 300 passes its MOT first time 78% of the time, from 2,636 MOT tests. See pass rates by year, common failures and typical mileage.

- First-time MOT pass rate: 78%
- MOT tests analysed: 2,636 (DVSA anonymised MOT data, 2025)
- Most common failure area: Lights & electrics

## By year of first use and fuel

| Year | Fuel | MOT tests | First-time pass rate |
| --- | --- | --- | --- |
| 2022 | ED | 1 (very few mots) | 100% |
| 2022 | Electric | 1 (very few mots) | 100% |
| 2021 | ED | 1 (very few mots) | 100% |
| 2021 | Hybrid | 1 (very few mots) | 100% |
| 2021 | Petrol | 1 (very few mots) | 100% |
| 2020 | Diesel | 1 (very few mots) | 100% |
| 2020 | ED | 1 (very few mots) | 100% |
| 2019 | Hybrid | 2 (very few mots) | 100% |
| 2019 | Diesel | 1 (very few mots) | 100% |
| 2019 | ED | 1 (very few mots) | 100% |
| 2019 | Petrol | 1 (very few mots) | 100% |
| 2018 | Petrol | 1 (very few mots) | 100% |
| 2017 | Petrol | 4 (very few mots) | 100% |
| 2016 | ED | 1 (very few mots) | 100% |
| 2015 | ED | 3 (very few mots) | 67% |
| 2014 | ED | 1 (very few mots) | 100% |
| 2012 | Diesel | 2 (very few mots) | 100% |
| 2012 | Petrol | 1 (very few mots) | 100% |
| 2011 | Diesel | 6 (very few mots) | 50% |
| 2010 | Diesel | 3 (very few mots) | 67% |
| 2010 | Petrol | 1 (very few mots) | 0% |
| 2009 | Diesel | 4 (very few mots) | 75% |
| 2009 | Petrol | 4 (very few mots) | 100% |
| 2008 | Diesel | 2 (very few mots) | 100% |
| 2007 | Diesel | 3 (very few mots) | 33% |
| 2007 | Petrol | 1 (very few mots) | 100% |
| 2006 | Diesel | 4 (very few mots) | 50% |
| 2006 | Petrol | 1 (very few mots) | 0% |
| 2005 | Petrol | 1 (very few mots) | 100% |
| 2003 | Petrol | 1 (very few mots) | 100% |
| 2001 | Petrol | 1 (very few mots) | 0% |
| 2000 | Petrol | 4 (very few mots) | 75% |
| 1999 | Diesel | 3 (very few mots) | 67% |
| 1998 | Petrol | 2 (very few mots) | 50% |
| 1998 | Diesel | 1 (very few mots) | 100% |
| 1997 | Diesel | 2 (very few mots) | 100% |
| 1997 | Petrol | 2 (very few mots) | 100% |
| 1996 | Petrol | 6 (very few mots) | 100% |
| 1995 | Petrol | 2 (very few mots) | 100% |
| 1995 | Diesel | 1 (very few mots) | 100% |
| 1994 | Petrol | 17 (very few mots) | 65% |
| 1994 | Diesel | 7 (very few mots) | 71% |
| 1993 | Petrol | 125 | 78% |
| 1993 | Diesel | 56 (few mots) | 61% |
| 1992 | Petrol | 265 | 82% |
| 1992 | Diesel | 87 (few mots) | 64% |
| 1992 | LPG | 1 (very few mots) | 100% |
| 1991 | Petrol | 260 | 77% |
| 1991 | Diesel | 74 (few mots) | 68% |
| 1990 | Petrol | 229 | 76% |
| 1990 | Diesel | 48 (few mots) | 65% |
| 1989 | Petrol | 485 | 82% |
| 1989 | Diesel | 36 (few mots) | 75% |
| 1988 | Petrol | 343 | 80% |
| 1988 | Diesel | 27 (few mots) | 70% |
| 1987 | Petrol | 260 | 85% |
| 1987 | Diesel | 20 (few mots) | 70% |
| 1986 | Petrol | 146 | 79% |
| 1986 | Diesel | 16 (very few mots) | 63% |
| 1985 | Diesel | 21 (few mots) | 86% |
| 1985 | Petrol | 1 (very few mots) | 0% |
| 1984 | Diesel | 12 (very few mots) | 75% |
| 1983 | Diesel | 5 (very few mots) | 80% |
| 1982 | Diesel | 4 (very few mots) | 100% |
| 1980 | Diesel | 1 (very few mots) | 100% |
| 1980 | Petrol | 1 (very few mots) | 100% |
| 1979 | Diesel | 1 (very few mots) | 100% |
| 1972 | Petrol | 1 (very few mots) | 100% |
| 1971 | Petrol | 1 (very few mots) | 0% |
| 1970 | Petrol | 2 (very few mots) | 100% |
| 1969 | Petrol | 1 (very few mots) | 100% |
| 1968 | Petrol | 1 (very few mots) | 100% |
| 1964 | Petrol | 2 (very few mots) | 100% |

---

Canonical page: https://regflags.co.uk/reliability/mercedes-benz/300
RegFlags by Steady Circuit Ltd.