2020 Porsche Taycan 4S 79Kwh — MOT failures & pass rate
Across 1,162 MOT tests analysed for the 2020 Porsche Taycan 4S 79Kwh, the most common recorded failure areas were tyres, other defects and lighting & signalling. Its pass rate of 92.6% was above the average for cars of a similar age (90.5%).
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 5.8% | 67 |
| 2 | Other defects | 0.9% | 10 |
| 3 | Lighting & signalling | 0.8% | 9 |
| 4 | Visibility | 0.7% | 8 |
| 5 | Brakes | 0.5% | 6 |
| 6 | Suspension | 0.3% | 4 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Registration plates | 17 |
| 2 | Headlamp aim | 10 |
| 3 | Tread depth | 6 |
| 4 | Ball joint | 4 |
| 5 | Windscreen | 3 |
| 6 | Washers | 3 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 20.6% | 239 |
| 2 | Other defects | 4.2% | 49 |
| 3 | Visibility | 1.5% | 17 |
| 4 | Brakes | 1.5% | 17 |
| 5 | Lighting & signalling | 0.4% | 5 |
| 6 | Road wheels | 0.3% | 4 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 710 | 5.3% |
| 30-60k | 408 | 10.8% |
| 60-90k | 39 | 10.3% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2023 | 378 | 6.6% |
| 2024 | 381 | 7.6% |
| 2025 | 403 | 7.9% |
What to check before buying a 2020 Taycan 4S 79Kwh
Before buying a 2020 Porsche Taycan 4S 79Kwh, focus on the areas it most often fails on. Tyres accounted for 5.8% of tests for this year.
- Tyres (5.8% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
- Other defects (0.9% of tests): Miscellaneous items not in the main categories. Typical repair: varies.
- Lighting & signalling (0.8% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 2020 Porsche Taycan 4S 79Kwhs pass their MOT?
92.6% of the 1,162 2020 Porsche Taycan 4S 79Kwh MOT tests in this dataset passed — a 7.4% fail rate.
What is the most common MOT failure on a 2020 Porsche Taycan 4S 79Kwh?
Tyres, recorded in 5.8% of tests, followed by other defects (0.9%).
Does the 2020 Taycan 4S 79Kwh get worse with mileage?
Its MOT fail rate rises from 5.3% in the 0-30k band to 10.3% in the 60-90k band.
Methodology & source. Based on 1,162 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-01. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.