2018 Porsche Cayenne MOT pass rate: 90.3% (5,434 tests)
Is the 2018 Cayenne getting worse?
Pass rate of 2018-registered cars across recent test years:
| Test year | Pass rate | |
|---|---|---|
| 2023 | 91.7% +3.7 vs same-age |
|
| 2024 | 88.9% +2.7 vs same-age |
|
| 2025 | 90.3% +5.6 vs same-age |
The raw rate normally falls as cars age. The “vs same-age” figure compares this cohort with all UK cars registered in the same year, so normal ageing is not mistaken for a bad model year.
What fails on a 2018 Cayenne
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Tyres | 323 | 40.4% |
| 2 | Brakes | 118 | 14.8% |
| 3 | Suspension | 117 | 14.6% |
| 4 | Visibility | 54 | 6.8% |
| 5 | Noise, emissions and leaks | 46 | 5.8% |
| 6 | Identification of the vehicle | 45 | 5.6% |
All Cayenne years compared
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2003 | 1,515 | 79.3% | +14.3 pts | 120,063 |
| 2004 | 3,079 | 78.3% | +13.9 pts | 125,145 |
| 2005 | 3,695 | 78.9% | +14.4 pts | 120,920 |
| 2006 | 2,567 | 80.1% | +15.6 pts | 116,568 |
| 2007 | 1,972 | 78.3% | +13.2 pts | 110,811 |
| 2008 | 1,706 | 81.0% | +15.9 pts | 105,770 |
| 2009 | 2,401 | 79.0% | +12.6 pts | 115,235 |
| 2010 | 2,509 | 84.6% | +17.2 pts | 110,287 |
| 2011 | 3,262 | 85.1% | +15.9 pts | 108,084 |
| 2012 | 5,314 | 84.4% | +13.1 pts | 100,132 |
| 2013 | 6,405 | 85.4% | +12.1 pts | 93,652 |
| 2014 | 5,612 | 86.7% | +10.9 pts | 84,602 |
| 2015 | 7,015 | 88.9% | +10.2 pts | 76,270 |
| 2016 | 8,292 | 88.3% | +7.0 pts | 68,726 |
| 2017 | 5,343 | 89.2% | +5.2 pts | 60,682 |
| 2018 (this page) | 5,434 | 90.3% | +4.0 pts | 49,000 |
| 2019 | 9,138 | 93.8% | +5.5 pts | 37,054 |
| 2020 | 6,277 | 93.6% | +3.7 pts | 31,329 |
| 2021 | 2,808 | 94.3% | +3.9 pts | 28,443 |
Weighing up which year to buy? See the full ranking: Porsche Cayenne years to avoid.
- Free MOT history checkThe exact car’s failures, advisories and mileage trail — sellers can’t edit it
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FAQs
Is a 2018 Porsche Cayenne reliable?
2018-registered examples passed 90.3% of their MOT tests (5,434 tests, 2023–2025), +4.0 points versus all UK cars registered in the same year. At roughly 8 years old with a median 49,000 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2018 Cayenne?
The median tested example shows 49,000 miles. Anything far beyond that isn't automatically bad — a motorway-mile car with consistent service records often beats a low-mileage school-run car — but price accordingly and scrutinise the mileage trail for gaps or drops.
Should I buy the petrol or diesel 2018 Cayenne?
In this cohort petrols pass 92.2% of tests against 86.4% for diesels. Mileage and use can explain part of that gap, so treat it as a reason to inspect DPF and emissions history, not a fuel-type verdict.
Source: DVSA Anonymised MOT tests and results, 2023–2025 extracts (96 million Class 4 initial tests; retests excluded). Only vehicles old enough for a routine first MOT are included. Age-adjusted figures compare the model-year cohort with all vehicles of the same registration year tested in the same calendar year. Contains public sector information licensed under OGL v3.0.