The picture
Is250: middle-of-the-pack on first-time pass
Across 11,785 MOT tests, the Is250 returns 77.6% first-time pass — roughly in line with the UK fleet average. The single most-logged Major fail is a defective headlamp lens. Windscreen damage and tyre tread under the limit round out the top three. Average tested mileage sits at 98,997, 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.
Top ten reasons for rejection.
- 01
Headlamp reflector or lens slightly defective
618 occurrences · 5.2% of tests
- 02
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
343 occurrences · 2.9% of tests
- 03
Tyre tread depth not in accordance with the requirements
335 occurrences · 2.8% of tests
- 04
a brake lining or pad worn below 1.5mm
314 occurrences · 2.7% of tests
- 05
A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
308 occurrences · 2.6% of tests
- 06
The aim of a headlamp is not within limits laid down in the requirements
262 occurrences · 2.2% of tests
- 07
Wiper blade defective
205 occurrences · 1.7% of tests
- 08
Wiper blade missing or obviously not clearing the windscreen
180 occurrences · 1.5% of tests
- 09
A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED
179 occurrences · 1.5% of tests
- 10
A tyre cords visible or damaged
174 occurrences · 1.5% 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 3 failures
£150–£335
If every one of this Is250'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.
Tools that pre-empt a retest.
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
Headlight restoration kit
Yellowed lenses fail the light-output test. A restoration kit lifts the haze in an afternoon for £20.
Search Amazon UK
Item 02 · 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 03 · Amazon UK
Brake pad measurement gauge
Testers fail pads under 1.5mm. A wear gauge tells you if you've got two months left or two weeks.
Search Amazon UK
Buying or keeping a Is250?
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 Is250 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.