Most Reliable Porsche Models: Real MOT Data Analysis
We analysed 169,644 real UK MOT tests to reveal which Porsche models pass most often, which years to buy, and which to avoid entirely.
169,644 MOT tests analysed
Real DVSA data covering every Porsche model from 1996-2023
Key Findings
Most Reliable Model
Porsche macan
91.7% pass rate
Best Single Year
911 2010 Petrol
91.3% pass rate
Porsche vs National Average
86.4% vs 71.4%
+15.0% above average
Proven Durability Champion
911
+30.3% at 15-17 years
How reliable are Porsches really? We analysed 169,644 real MOT tests from the DVSA database to find out which Porsche models pass most often and which years are worth buying.
This isn't survey data or owner opinions. These are actual pass/fail results from UK garages, covering Porsche models sold in the UK from 2000 to 2023.
How Porsche Compares to Rivals
Porsche ranks #50 out of 180 manufacturers with a 86.4% average MOT pass rate. That's above the national average of 71.4%:
| Manufacturer | Pass Rate | Rank | Tests Analysed |
|---|---|---|---|
| Porsche | 86.4% | #50 | 169,644 |
| Lexus | 83.1% | #66 | 159,314 |
| Bmw | 78.3% | #92 | 1,841,164 |
| Jaguar | 78.2% | #93 | 351,545 |
| Audi | 77.8% | #96 | 1,670,675 |
| Mercedes-Benz | 76.8% | #100 | 1,697,161 |
| Alfa Romeo | 67.3% | #147 | 75,196 |
The verdict: Porsche leads its competitors with a 86.4% pass rate.
Best Porsche Models by MOT Pass Rate
Looking at overall reliability across all years, here's how Porsche's core models rank against the 71.4% national average:
| Model | Pass Rate | vs National (71.4%) | Tests | Years |
|---|---|---|---|---|
| macan | 91.7% | +20.2% | 26,751 | 2014-2022 |
| TAYCAN | 90.2% | +18.7% | 2,582 | 2020-2021 |
| CAYMAN | 88.8% | +17.3% | 14,097 | 2005-2021 |
| PANAMERA | 87.3% | +15.8% | 7,009 | 2009-2022 |
| CAYENNE | 84.1% | +12.6% | 29,340 | 2003-2022 |
| BOXSTER | 82.0% | +10.6% | 33,163 | 1996-2023 |
* Compared to overall 71.4% national average across all years. For year-adjusted comparisons that account for newer cars passing more often, see individual model breakdowns below.
Top performer
The macan achieves a 91.7% pass rate, 20 percentage points above the national average.
Proven Durability Champions: Which Porsche Models Age Best?
These Porsche models have proven exceptional durability with 11+ years of real-world MOT data. They consistently outperform the national average for cars of the same age:
High-confidence data: Only vehicles with 11+ years of MOT history and 100+ tests are included in this ranking.
| Model | Year | Fuel | vs Same-Age Average | Tested At | Pass Rate |
|---|---|---|---|---|---|
| 911 | - | All | +30.3% | 15-17 years | 88.1% |
| 911 | - | All | +28.4% | 18-20 years | 84.6% |
| BOXSTER | - | All | +27.9% | 15-17 years | 85.8% |
| 911 | - | All | +27.4% | 11-14 years | 92.0% |
| BOXSTER | - | All | +26.2% | 11-14 years | 90.9% |
| CAYMAN | - | All | +25.6% | 11-14 years | 90.3% |
| CAYMAN | - | All | +23.4% | 15-17 years | 81.3% |
| BOXSTER | - | All | +22.7% | 18-20 years | 78.9% |
| 911 | - | All | +21.6% | 21+ years | 82.6% |
| 968 | - | All | +21.4% | 21+ years | 82.4% |
How to read this: A score of "+15%" means the model passes MOTs 15 percentage points more often than the average car of the same age. These are proven results from vehicles that have genuinely aged well.
Proven durability champion
The 911 outperforms the average 15-17 years-old car by 30 percentage points, with 5,843 MOT tests proving its reliability.
Early Performers: Strong Start, Unproven Durability
These newer Porsche models (3-6 years old) show strong early results, but haven't yet proven long-term durability:
Important caveat: Durability NOT yet proven - too early to assess long-term reliability. Older versions of the same model may tell a different story at 11+ years.
| Model | Year | Fuel | vs Same-Age Average | Tested At | Pass Rate |
|---|---|---|---|---|---|
| 911 | - | All | +19.3% | 8-10 years | 94.8% |
| CAYMAN | - | All | +18.1% | 8-10 years | 93.5% |
| BOXSTER | - | All | +17.5% | 8-10 years | 92.9% |
| macan | - | All | +12.9% | 8-10 years | 88.3% |
| PANAMERA | - | All | +11.9% | 8-10 years | 87.3% |
| CAYMAN | - | All | +10.3% | 3-7 years | 95.1% |
| CAYENNE | - | All | +10.3% | 8-10 years | 85.7% |
| 911 | - | All | +9.8% | 3-7 years | 94.5% |
What this means: These models are performing well in their early years, but we recommend checking the Durability Champions section above to see how older versions of the same model family have fared over time.
Porsche BOXSTER: Year-by-Year Breakdown
The BOXSTER has 33,163 tests in our database with an overall 82.0% pass rate:
| Year | Fuel | Pass Rate | vs Same-Year Avg | Tests |
|---|---|---|---|---|
| 2019 | Petrol | 93.8% | +7.5% | 930 |
| 2018 | Petrol | 93.9% | +9.7% | 1,034 |
| 2017 | Petrol | 93.9% | +12.2% | 1,012 |
| 2016 | Petrol | 92.5% | +13.9% | 1,232 |
| 2015 | Petrol | 94.3% | +18.8% | 1,074 |
| 2014 | Petrol | 92.1% | +20.4% | 1,204 |
| 2013 | Petrol | 92.7% | +24.4% | 1,280 |
| 2012 | Petrol | 89.0% | +23.3% | 1,105 |
| 2011 | Petrol | 90.3% | +27.4% | 777 |
| 2010 | Petrol | 91.1% | +30.6% | 808 |
| 2009 | Petrol | 89.5% | +30.5% | 841 |
| 2008 | Petrol | 86.6% | +29.2% | 1,088 |
BOXSTER verdict: The 2019 petrol model achieves a 93.8% pass rate (22 points above average).
Porsche CAYENNE: Year-by-Year Breakdown
The CAYENNE has 29,340 tests in our database with an overall 84.1% pass rate:
| Year | Fuel | Pass Rate | vs Same-Year Avg | Tests |
|---|---|---|---|---|
| 2020 | Petrol | 93.7% | +6.0% | 1,185 |
| 2020 | Hybrid Electric | 92.9% | +5.2% | 1,246 |
| 2019 | Hybrid Electric | 95.3% | +9.1% | 761 |
| 2019 | Petrol | 93.7% | +7.5% | 2,470 |
| 2018 | Petrol | 92.4% | +8.2% | 1,119 |
| 2018 | Diesel | 84.3% | +0.1% | 547 |
| 2017 | Diesel | 87.2% | +5.5% | 1,140 |
| 2016 | Diesel | 85.9% | +7.2% | 2,185 |
| 2015 | Diesel | 86.5% | +11.0% | 1,802 |
| 2014 | Diesel | 83.7% | +12.0% | 1,625 |
| 2013 | Diesel | 82.0% | +13.8% | 1,911 |
| 2012 | Diesel | 79.7% | +14.1% | 1,596 |
CAYENNE verdict: The 2020 petrol model achieves a 93.7% pass rate (22 points above average).
Porsche macan: Year-by-Year Breakdown
The macan has 26,751 tests in our database with an overall 91.7% pass rate:
| Year | Fuel | Pass Rate | vs Same-Year Avg | Tests |
|---|---|---|---|---|
| 2020 | Petrol | 93.4% | +5.7% | 3,589 |
| 2019 | Petrol | 94.3% | +8.1% | 4,727 |
| 2018 | Petrol | 94.1% | +9.8% | 3,540 |
| 2017 | Petrol | 93.0% | +11.3% | 2,895 |
| 2017 | Diesel | 91.5% | +9.8% | 2,534 |
| 2016 | Petrol | 90.7% | +12.1% | 1,809 |
| 2016 | Diesel | 88.7% | +10.0% | 2,384 |
| 2015 | Petrol | 89.3% | +13.8% | 1,066 |
| 2015 | Diesel | 86.6% | +11.2% | 2,522 |
| 2014 | Diesel | 85.3% | +13.6% | 824 |
macan verdict: The 2020 petrol model achieves a 93.4% pass rate (22 points above average).
Porsche CAYMAN: Year-by-Year Breakdown
The CAYMAN has 14,097 tests in our database with an overall 88.8% pass rate:
| Year | Fuel | Pass Rate | vs Same-Year Avg | Tests |
|---|---|---|---|---|
| 2019 | Petrol | 96.0% | +9.8% | 1,058 |
| 2018 | Petrol | 94.0% | +9.7% | 1,209 |
| 2017 | Petrol | 94.9% | +13.2% | 884 |
| 2016 | Petrol | 94.1% | +15.5% | 985 |
| 2015 | Petrol | 94.4% | +18.9% | 1,125 |
| 2014 | Petrol | 92.2% | +20.5% | 1,203 |
| 2013 | Petrol | 91.0% | +22.8% | 1,050 |
| 2011 | Petrol | 89.9% | +26.9% | 536 |
| 2010 | Petrol | 88.6% | +28.1% | 534 |
| 2009 | Petrol | 89.3% | +30.3% | 662 |
| 2008 | Petrol | 78.8% | +21.4% | 897 |
| 2007 | Petrol | 79.2% | +22.2% | 1,439 |
CAYMAN verdict: The 2019 petrol model achieves a 96.0% pass rate (25 points above average).
Porsche Hybrids vs Petrol vs Diesel
Reliability varies by fuel type for Porsche. Here's how each performs:
| Fuel Type | Average Pass Rate | vs National | Tests |
|---|---|---|---|
| Electric | 89.9% | +18.5% | 2,621 |
| Hybrid Electric | 89.4% | +18.0% | 5,720 |
| Petrol | 86.4% | +15.0% | 136,996 |
| Diesel | 85.5% | +14.1% | 24,087 |
| Other | 80.6% | +9.1% | 36 |
The hybrid advantage: Porsche hybrids pass MOTs 3% more often than petrols and 4% more often than diesels.
What Goes Wrong on Porsches?
When Porsches fail MOTs, these are the most common causes:
| Failure Category | Total Failures |
|---|---|
| 1. Lamps, reflectors and electrical equipment | 7,996 |
| 2. Tyres | 6,011 |
| 3. Brakes | 4,226 |
| 4. Suspension | 3,876 |
| 5. Noise, emissions and leaks | 3,585 |
| 6. Visibility | 3,043 |
| 7. Body, chassis, structure | 2,145 |
Pre-MOT checklist for Porsche owners:
- Check all bulbs (number plate lights are commonly missed)
- Ensure tyres meet 1.6mm tread requirement
- Check brake pad thickness and disc condition
- Inspect suspension bushes and anti-roll bar links
- Check exhaust system for leaks and emissions
Frequently Asked Questions
Our Buying Recommendations
Best If Buying Nearly New
2019-2023 models with highest early pass rates
- CAYMAN 2019 Petrol: 96% pass rate
- CAYENNE 2019 Hybrid Electric: 95% pass rate
- 911 2019 Petrol: 95% pass rate
- macan 2019 Petrol: 94% pass rate
Note: Long-term durability not yet proven for these newer models
Best If Buying Used (Proven)
11+ years of proven durability data
- 911 (15-17 years): +27% vs same-age (proven at 11+ years)
- BOXSTER (15-17 years): +22% vs same-age (proven at 11+ years)
- CAYMAN (11-14 years): +23% vs same-age (proven at 11+ years)
- 968 (21+ years): +21% vs same-age (proven at 11+ years)
Porsche Models to Avoid (Proven Poor)
Proven below average at 11+ years - not just old, genuinely problematic
- No major proven reliability concerns
About This Data
This analysis uses real MOT test results from the DVSA database, covering 169,644 tests on Porsche vehicles between 2000 and 2023.
Year-Adjusted Scoring (v2.1): In year-by-year breakdowns, each vehicle is compared against the national average for vehicles of the same model year. This removes the natural bias where newer cars pass more often, allowing fair comparisons across eras.
Evidence-Tiered Durability: We separate "proven durability" (vehicles tested at 11+ years old) from "early performers" (3-6 years old). Only vehicles with proven long-term data are used for durability claims. Age-band comparisons use weighted national averages.
Minimum thresholds: 100 tests for proven durability rankings, 100 tests for early performer rankings. Pass rates are calculated as first-time passes, excluding retests.
The overall national average MOT pass rate is 71.44% based on 32,300,000 tests across all manufacturers. Year-specific averages range from ~59% (2009 vehicles) to ~88% (2020 vehicles).
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