Vauxhall
Signum
2,244 MOT tests analysed. runs below the UK fleet average — here's where Signums pass, fail, and end up on the retest sheet.
That's 9.5 points below the UK fleet average across our 1,984 tracked models — buyers should expect more first-time fails than the typical UK car.
Pass
68.0%
Pass-after-fix
4.2%
Fail
26.7%
Avg miles
124,448
Pass + Pass-after-fix + Fail = 100%
Diesel cars registered before September 2015 are typically pre-Euro 6 — subject to daily charges in London ULEZ (£12.50), Birmingham CAZ (£8), Bristol CAZ (£9), and Glasgow LEZ. Daily charges if driven in the zone: London £12.50 · Birmingham £8.00 · Bristol £9.00 .
The picture
Signum: a below-average pass rate worth digging into
Across 2,222 MOT tests, the Signum returns 66.0% first-time pass — well below the UK fleet average. The single most-logged Major fail is a number-plate lamp out. A defective headlamp lens and a broken or weak spring round out the top three. Average tested mileage sits at 121,858, 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.
ABI Insurance Group
Group 16–26
Around the UK fleet average for insurance cost. Lower groups cost less to insure; UK fleet average is around Group 22.
Source: ABI Group Rating Panel · administered by Thatcham Research · groups cover standard variants; performance trims may sit higher. Browse all insurance groups →
16–26
out of 50
Top ten reasons for rejection.
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- 01
A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources
173 occurrences · 7.7% of tests
- 02
A transmission shaft constant velocity joint boot severely deteriorated
105 occurrences · 4.7% of tests
- 03
A spring or spring component fractured or seriously weakened
105 occurrences · 4.7% of tests
- 04
Headlamp reflector or lens slightly defective
88 occurrences · 3.9% of tests
- 05
Brake pipe damaged or excessively corroded
82 occurrences · 3.7% of tests
- 06
The aim of a headlamp is not within limits laid down in the requirements
76 occurrences · 3.4% of tests
- 07
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
67 occurrences · 3.0% of tests
- 08
A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc
65 occurrences · 2.9% of tests
- 09
Tyre tread depth not in accordance with the requirements
57 occurrences · 2.5% of tests
- 10
A suspension pin, bush or joint excessively worn
55 occurrences · 2.5% 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 4 failures
£138–£445
If every one of this Signum'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
H7 / W21W bulb pack
A spare-bulb kit lives in the boot. Test morning is not the time to find your stop-lamp's gone.
Search Amazon UK
Item 02 · 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
My Motor World · affiliate
Parts & supplies for this fix
Affiliate links — small commission, no extra cost to you.
Summit
Summit ADRG-13 Vauxhall Replacement Stick-On Tinted Mirror Glass RHS
£9.89
View at My Motor World →
Summit
Summit ADRG-25 Vauxhall Replacement Stick-On Tinted Mirror Glass LHS
£10.99
View at My Motor World →
Summit
Summit ADRG-32 Vauxhall Replacement Stick-On Tinted Mirror Glass LHS
£12.09
View at My Motor World →
Summit
Summit ADRG-43 Vauxhall Replacement Stick-On Tinted Mirror Glass RHS
£12.09
View at My Motor World →
Click Mechanic · affiliate
Book a mobile mechanic
Affiliate links — small commission, no extra cost to you.
Mobile mechanic · UK-wide
Book a mechanic at your door.
Fixed-price quotes upfront. No garage needed. Click Mechanic sends a vetted local mechanic to you — home, work, or roadside.
Recall history
3 UK recalls on record.
The Signum has 3 official UK vehicle recalls covering defect details, remedies, and affected build dates.
Buying or keeping a Signum?
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 Signum 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.