Porsche
1,933 MOT tests analysed. sits above the UK fleet average — here's where Taycan 4S 79kwhs pass, fail, and end up on the retest sheet.
That's 14.9 points above the UK fleet average across our 1,984 tracked models — a confident result.
Pass
92.4%
Pass-after-fix
0.9%
Fail
4.8%
Avg miles
29,295
Pass + Pass-after-fix + Fail = 100%
Electric and hydrogen vehicles are exempt from all UK clean air zone charges.
Performance by cohort
2 year bands · 1,933 tests
Pass rate drops 1.6 points across the cohorts — recent Taycan 4S 79kwh examples are doing worse than the early cars at the same tested age.
Pass
93.0%
Fail
3.6%
PRS
1.4%
Avg mileage at test
30,535 mi
Pass
91.4%
Fail
6.7%
PRS
0.0%
Avg mileage at test
27,249 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.
The picture
Across 1,933 MOT tests, the Taycan 4s 79kwh returns 92.4% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a tyre with the cords showing. A seriously damaged tyre and a seriously damaged tyre round out the top three. Average tested mileage sits at 29,295, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.
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A tyre cords visible or damaged
24 occurrences · 1.2% of tests
A tyre seriously damaged
21 occurrences · 1.1% of tests
A tyre seriously damaged
20 occurrences · 1.0% of tests
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
6 occurrences · 0.3% of tests
Number plate does not conform to the specified requirements
6 occurrences · 0.3% of tests
A suspension pin, bush or joint excessively worn
6 occurrences · 0.3% of tests
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
5 occurrences · 0.3% of tests
Tyre tread depth not in accordance with the requirements
4 occurrences · 0.2% of tests
The aim of a headlamp is not within limits laid down in the requirements
4 occurrences · 0.2% of tests
A tyre pressure monitoring system malfunctioning or obviously inoperative
3 occurrences · 0.2% of tests
Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.
Worst-case fix budget · top 2 failures
£75–£130
If every one of this Taycan 4S 79kwh's most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →
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Build your own retest budget.
Year-band analysis
First-time MOT pass rate split by registration band. A 1.6-point gap between bands is modest — the year you buy Porsche Taycan 4S 79kwh makes a small but real difference to MOT outcomes.
Best band to buy
93.0%
2018–2020 registration
the 2018–2020 band climbs to 93.0% — a 1.6-point improvement. Failures here are mostly wear items: has a bulge, caused by separation or…, has ply or cords exposed — the structural issues that drag down older examples don't appear in the top-10 for this band.
Band to be cautious about
91.4%
2021+ registration
On the 2021-on band, the data shows a 91.4% pass rate against a fleet average of 93.0% on the newer band. The main culprits logged at test: has a cut in excess of the…, has ply or cords exposed, and has a bulge, caused by separation or…. Average mileage on test for this band is 27,249 miles — high-mileage wear items are a recurring theme.
Best band to buy: 2018-2020 (93.0% first-time pass). Worst band to avoid: 2021+ (91.4% pass). That's a 1.6-point spread across 733 older tests and 1,200 newer ones — year of build makes a material difference on this model.
Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.
Item 01 · Amazon UK
Digital tyre-tread depth gauge
Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.
Search Amazon UK
Item 02 · Amazon UK
MOT-spec replacement number plate
Faded or non-standard plates fail outright. Replacements take ten minutes online with V5C details.
Search Amazon UK
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Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.
If you own a Taycan 4S 79kwh and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.
