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Porsche
928 S
1,614 MOT tests analysed. sits above the UK fleet average — here's where 928 Ss pass, fail, and end up on the retest sheet.
That's 3.5 points above the UK fleet average across our 1,984 tracked models — a confident result.
Pass
81.0%
Pass-after-fix
2.1%
Fail
16.2%
Avg miles
112,722
Pass + Pass-after-fix + Fail = 100%
This model's production run straddles the January 2006 Euro 4 cutoff. Individual cars vary — check your registration plate on the government's ULEZ checker. Daily charges if driven in the zone: London £12.50 · Birmingham £8.00 .
The picture
928 S: middle-of-the-pack on first-time pass
Across 658 MOT tests, the 928 S returns 78.9% first-time pass — roughly in line with the UK fleet average. The single most-logged Major fail is a split CV-joint boot. An obligatory rear fog lamp missing and windscreen washers not working round out the top three. Average tested mileage sits at 107,854, 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 38–50
A high-group car — insurance costs will be significantly above average. 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 →
38–50
out of 50
Top ten reasons for rejection.
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- 01
An obligatory rear fog lamp missing, or a front or rear fog lamp inoperative or in the case of a multiple light source more than 1/2 not functioning
46 occurrences · 2.9% of tests
- 02
A rear registration plate lamp or light source missing or inoperative in the case of multiple lamps or light sources
41 occurrences · 2.5% of tests
- 03
Emissions levels exceed default limits
26 occurrences · 1.6% of tests
- 04
The aim of a headlamp is not within limits laid down in the requirements
26 occurrences · 1.6% of tests
- 05
Steering rack gaiter or ball joint dust cover damaged or deteriorated
25 occurrences · 1.5% of tests
- 06
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
24 occurrences · 1.5% of tests
- 07
A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning
22 occurrences · 1.4% of tests
- 08
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
21 occurrences · 1.3% of tests
- 09
A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc
21 occurrences · 1.3% of tests
- 10
A transmission shaft constant velocity joint boot severely deteriorated
20 occurrences · 1.2% 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 3 failures
£98–£355
If every one of this 928 S'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
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Draper Expert
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£4.28
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Motor World
Motor World Porsche Cayenne 2003-2012 Car Floor Mat Set
£32.99
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Motor World Porsche 911 Coupe 2004-, Cabriolet 2005- & Targe 2006- Car Floor Mat Set
£32.99
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Click Mechanic · affiliate
Book a mobile mechanic
Affiliate links — small commission, no extra cost to you.
Mobile mechanic · UK-wide
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Fixed-price quotes upfront. No garage needed. Click Mechanic sends a vetted local mechanic to you — home, work, or roadside.
Buying or keeping a 928 S?
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 928 S 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.