On average, 31.9% of cars will fail their MoT test in Cardiff, which puts the region above the national average of 29.7%. The most common failure causes are Suspension, Lamps, reflectors and electrical equipment and Brakes.
Cars registered in 2004 have the worst overall MoT pass rate, at 48.4%. The manufacturers with the highest fail rate in this region are Chevrolet, Rover and Daewoo. At the opposite end of the scale with the best pass rates are Lexus, Bentley and Aston Martin.
| Test Item | Failure Rate | National Failure Rate | Relative Rate |
|---|---|---|---|
| Suspension | 10.1% | 9.6% | +6% |
| Lamps, reflectors and electrical equipment | 10.1% | 11.9% | −15% |
| Brakes | 8.2% | 7.7% | +7% |
| Tyres | 7.0% | 5.8% | +21% |
| Visibility | 5.9% | 5.3% | +10% |
| Body, chassis, structure | 3.8% | 4.1% | −7% |
| Noise, emissions and leaks | 3.4% | 3.6% | −4% |
| Steering | 2.0% | 1.9% | +6% |
| Seat belts and supplementary restraint systems | 1.3% | 1.3% | +4% |
| Year of Registration | Tests | Failure Rate | National Failure Rate | Relative Rate |
| 2021 | 61 | 16.4% | 17.5% | −7% |
| 2020 | 199 | 13.6% | 16.7% | −19% |
| 2019 | 1,509 | 8.3% | 10.3% | −19% |
| 2018 | 36,588 | 11.6% | 11.7% | −1% |
| 2017 | 36,343 | 13.9% | 13.2% | +5% |
| 2016 | 41,073 | 18.4% | 16.5% | +11% |
| 2015 | 41,213 | 22.6% | 19.5% | +16% |
| 2014 | 40,650 | 26.8% | 23.0% | +16% |
| 2013 | 36,746 | 31.7% | 27.2% | +17% |
| 2012 | 30,846 | 35.2% | 30.5% | +16% |
| 2011 | 27,341 | 39.0% | 33.4% | +17% |
| 2010 | 26,110 | 42.9% | 36.8% | +16% |
| 2009 | 23,596 | 44.8% | 39.1% | +15% |
| 2008 | 21,755 | 47.6% | 41.5% | +15% |
| 2007 | 20,626 | 48.0% | 42.6% | +13% |
| 2006 | 16,318 | 49.9% | 43.9% | +14% |
| 2005 | 12,552 | 50.3% | 44.9% | +12% |
| 2004 | 9,547 | 51.6% | 45.7% | +13% |
| 2003 | 6,945 | 50.5% | 45.6% | +11% |
| 2002 | 4,824 | 50.9% | 45.2% | +13% |
| 2001 | 2,834 | 48.3% | 43.9% | +10% |
| 2000 | 1,748 | 46.2% | 42.5% | +9% |
| 1999 | 1,221 | 47.3% | 40.8% | +16% |
| 1998 | 873 | 43.8% | 38.5% | +14% |
| 1997 | 615 | 42.1% | 37.5% | +12% |
| 1996 | 339 | 41.3% | 36.5% | +13% |
| 1995 | 274 | 41.6% | 35.3% | +18% |
| 1994 | 191 | 38.7% | 34.4% | +13% |
| 1993 | 195 | 38.5% | 34.7% | +11% |
| 1992 | 202 | 34.2% | 32.9% | +4% |
| 1991 | 202 | 34.7% | 32.3% | +7% |
| 1990 | 215 | 34.0% | 30.9% | +10% |
| 1989 | 173 | 36.4% | 29.6% | +23% |
| 1988 | 134 | 33.6% | 30.2% | +11% |
| 1987 | 89 | 32.6% | 29.5% | +10% |
| 1986 | 71 | 29.6% | 28.9% | +3% |
| 1985 | 62 | 24.2% | 28.3% | −15% |
| 1984 | 51 | 15.7% | 28.1% | −44% |
| Make | Tests | Failure Rate | National Failure Rate | Relative Rate |
|---|---|---|---|---|
| Aston Martin | 104 | 13.5% | 10.3% | +31% |
| Bentley | 164 | 15.2% | 10.3% | +47% |
| Lexus | 1,893 | 17.1% | 18.7% | −9% |
| Porsche | 1,923 | 18.4% | 14.9% | +23% |
| MG | 2,079 | 20.4% | 28.9% | −29% |
| Abarth | 338 | 20.7% | 20.8% | −0% |
| Skoda | 9,188 | 24.4% | 23.5% | +4% |
| Audi | 23,424 | 24.4% | 22.3% | +10% |
| Dacia | 4,065 | 25.2% | 24.7% | +2% |
| Land Rover | 9,878 | 26.0% | 25.2% | +3% |
| BMW | 22,623 | 26.1% | 22.9% | +14% |
| Kia | 12,587 | 27.2% | 26.5% | +3% |
| Isuzu | 610 | 27.5% | 40.7% | −32% |
| Mercedes-Benz | 15,860 | 27.6% | 22.3% | +24% |
| MINI | 9,345 | 27.6% | 25.5% | +9% |
| Jaguar | 4,410 | 27.7% | 23.9% | +16% |
| SEAT | 7,963 | 27.7% | 27.1% | +2% |
| Jeep | 922 | 28.3% | 26.1% | +9% |
| Hyundai | 16,236 | 28.6% | 26.1% | +10% |
| SsangYong | 398 | 28.6% | 30.6% | −6% |
| Suzuki | 9,582 | 29.0% | 27.5% | +5% |
| Toyota | 19,265 | 29.2% | 27.1% | +8% |
| Honda | 11,727 | 29.8% | 28.2% | +5% |
| Subaru | 567 | 29.8% | 27.8% | +7% |
| Mazda | 7,765 | 31.2% | 28.2% | +11% |
| Volvo | 6,859 | 31.4% | 28.9% | +9% |
| Mitsubishi | 5,224 | 32.3% | 28.7% | +12% |
| Volkswagen | 47,691 | 32.8% | 29.0% | +13% |
| Nissan | 24,112 | 33.2% | 29.5% | +12% |
| FIAT | 14,382 | 34.3% | 32.2% | +7% |
| smart | 174 | 35.6% | 31.9% | +12% |
| Ford | 89,710 | 35.8% | 31.5% | +14% |
| Peugeot | 23,374 | 37.0% | 34.0% | +9% |
| Alfa Romeo | 1,231 | 37.6% | 33.7% | +12% |
| Vauxhall | 48,775 | 37.7% | 34.2% | +10% |
| Citroen | 19,775 | 38.5% | 34.2% | +13% |
| DS | 3,353 | 40.4% | 36.3% | +11% |
| Renault | 22,333 | 41.7% | 38.6% | +8% |
| Chrysler | 319 | 41.7% | 41.2% | +1% |
| Daihatsu | 374 | 43.0% | 36.3% | +18% |
| SAAB | 1,069 | 43.7% | 39.5% | +10% |
| Dodge | 102 | 44.1% | 40.6% | +9% |
| Talbot | 140 | 47.1% | 47.1% | +0% |
| Chevrolet | 2,099 | 50.8% | 45.1% | +13% |
| Rover | 301 | 52.2% | 42.5% | +23% |
| Daewoo | 102 | 64.7% | 53.3% | +21% |
