MOT performance
Porsche 911: noise, emissions and leaks MOT failures
2.0% of 100,223 MOT tests on the Porsche 911 in 2023–2024 failed on noise, emissions and leaks, against 3.2% for all cars. Allowing for age, mileage and fuel, Porsche 911s failed on noise, emissions and leaks 54% less often than comparable cars, from 2,033 tests with a noise, emissions and leaks failure.
100,223 MOT tests on 54,057 vehicles, 2023–2024 · Source: DVSA (Open Government Licence) · Analysis: 73 Auto
Check a specific car's MOT history and running costsAt a glance
| Figure | Value | Basis |
|---|---|---|
| Tests failed on noise, emissions and leaks | 2.0% | 2,033 of 100,223 tests |
| All cars | 3.2% | n = 65,477,892 |
| vs similar cars | -54% | same age, mileage and fuel |
Noise, emissions and leaks items that fail most
| Item | Area | Share of tests |
|---|---|---|
| Catalyst emissions: Lambda reading after 2nd fast idle outside specified limits | Noise, emissions and leaks | 1.12% |
By registration year
| Registered | Tests | Failed on it | vs similar cars |
|---|---|---|---|
| 2021 | 1,621 | 0.2% | -28% |
| 2020 | 3,098 | 0.3% | -16% |
| 2019 | 4,735 | 0.3% | -36% |
| 2018 | 4,376 | 0.3% | -47% |
| 2017 | 3,812 | 0.1% | -81% |
| 2016 | 3,446 | 0.1% | -88% |
| 2015 | 3,454 | 0.5% | -60% |
| 2014 | 3,154 | 0.6% | -59% |
| 2013 | 2,571 | 0.8% | -58% |
| 2012 | 3,100 | 0.9% | -59% |
| 2011 | 2,542 | 0.6% | -73% |
| 2010 | 3,448 | 0.8% | -70% |
| 2009 | 2,932 | 1.3% | -67% |
| 2008 | 3,736 | 1.5% | -65% |
| 2007 | 4,911 | 3.1% | -33% |
| 2006 | 5,604 | 3.7% | -34% |
| 2005 | 5,626 | 3.6% | -42% |
| 2004 | 4,825 | 3.5% | -47% |
| 2003 | 5,241 | 3.9% | -46% |
| 2002 | 4,767 | 3.5% | -52% |
| 2001 | 2,999 | 3.4% | -55% |
| 2000 | 1,830 | 3.1% | -63% |
| 1999 | 2,425 | 3.8% | -54% |
| 1998 | 2,057 | 4.2% | -46% |
| 1997 | 1,449 | 2.1% | -68% |
| 1996 | 1,876 | 1.6% | -76% |
| 1995 | 1,309 | 2.3% | -66% |
| 1994 | 1,056 | 3.0% | -58% |
| 1993 | 516 | 5.0% | -29% |
| 1992 | 415 | 3.1% | -54% |
| 1991 | 600 | 2.7% | -62% |
| 1990 | 1,373 | 1.6% | -78% |
| 1989 | 1,061 | 2.2% | -69% |
| 1988 | 738 | 2.0% | -72% |
| 1987 | 756 | 3.3% | -54% |
| 1986 | 639 | 2.7% | -63% |
| 1985 | 530 | 2.8% | -61% |
| 1984 | 441 | 2.3% | -69% |
What this does and doesn't tell you
A higher failure rate on noise, emissions and leaks can reflect the design, typical use or how often owners replace parts before the MOT. It doesn't tell you about any one car: a specific Porsche 911's MOT history does. See MOT check.
Check a specific Porsche 911
Enter a UK registration to see that car's own MOT history and what it is likely to cost to own. Your first check is free and shows the vehicle summary and its headline ownership cost. The category-by-category breakdown is part of a paid check.
UK number plate or 17-character VIN
About this data. These are MOT test results, not a measure of mechanical reliability: a car's MOT outcome reflects its condition on the day, which depends on how it has been maintained and driven as well as how it was built. Figures cover class 4 vehicles (cars and light vans), normal tests only (retests excluded), outcomes pass, fail and pass after rectification at the station; vehicles at least 2.5 years old at test. Tests from 2023-01-01 to 2024-12-30. “Compared with similar cars” means compared with the national rate for cars of the same age, mileage band and fuel. Contains public sector information licensed under the Open Government Licence v3.0. Makes and models are matched to 73 Auto's vehicle catalogue; tests that can't be matched are left out rather than guessed. See how the MOT figures are produced.
Related
- All Porsche 911 MOT results
- Noise, emissions and leaks failures across all cars
- Porsche 911: brakes
- Porsche 911: steering
- Porsche 911: suspension
- Porsche 911: tyres
- Porsche 911: lights, reflectors and electrical
- Porsche 911: body, chassis and structure
- Porsche 911: driver's view of the road
- Porsche 911: seat belts and airbags
- How repair costs are estimated