Photo: Alexander Migl, CC BY-SA 4.0
Mercedes Benz
1,693 MOT tests analysed. sits above the UK fleet average — here's where Glb 220 Amg Line Prem + D 4M As pass, fail, and end up on the retest sheet.
That's 15.3 points above the UK fleet average across our 1,984 tracked models — a confident result.
Pass
92.8%
Pass-after-fix
1.5%
Fail
5.6%
Avg miles
29,824
Pass + Pass-after-fix + Fail = 100%
Diesel cars registered from September 2015 generally meet Euro 6 — compliant in London ULEZ, Birmingham CAZ, Bristol CAZ, and Glasgow LEZ.
Performance by cohort
2 year bands · 1,693 tests
Pass rate climbs 5.0 points across the cohorts — newer Glb 220 Amg Line Prem + D 4M A examples clear the test more reliably than the early cars.
Pass
89.7%
Fail
7.8%
PRS
2.5%
Avg mileage at test
32,648 mi
Pass
94.7%
Fail
4.2%
PRS
0.9%
Avg mileage at test
28,062 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.
The picture
Across 1,743 MOT tests, the Glb 220 Amg Line Prem D 4m A returns 89.8% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is a seriously damaged tyre. Tyre tread under the limit and a tyre with the cords showing round out the top three. Average tested mileage sits at 26,939, 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
Above average — worth comparing quotes before buying. 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 →
26–38
out of 50
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A tyre seriously damaged
36 occurrences · 2.1% of tests
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
19 occurrences · 1.1% of tests
A tyre cords visible or damaged
13 occurrences · 0.8% of tests
A transmission shaft constant velocity joint boot severely deteriorated
10 occurrences · 0.6% of tests
Wiper blade defective
9 occurrences · 0.5% of tests
Wiper blade missing or obviously not clearing the windscreen
8 occurrences · 0.5% of tests
Number plate does not conform to the specified requirements
8 occurrences · 0.5% of tests
a brake lining or pad worn below 1.5mm
7 occurrences · 0.4% of tests
Tyre tread depth not in accordance with the requirements
6 occurrences · 0.4% of tests
A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc
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
£80–£140
If every one of this Glb 220 Amg Line Prem + D 4M A'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 5.0-point gap between bands means the year you buy Mercedes Benz Glb 220 Amg Line Prem + D 4M A has a real effect on what turns up at the garage.
Best band to buy
94.7%
2021+ registration
the 2021-on band climbs to 94.7% — a 5.0-point improvement. Failures here are mostly wear items: has a cut in excess of the…, damaged but not adversely affecting driver's view — the structural issues that drag down older examples don't appear in the top-10 for this band. Post-2020 examples are early in their MOT life and generally show the cleanest records.
Band to be cautious about
89.7%
2018–2020 registration
On the 2018–2020 band, the data shows a 89.7% pass rate against a fleet average of 94.7% on the newer band. The main culprits logged at test: has a cut in excess of the…, constant velocity boot severely deteriorated, and has ply or cords exposed. Average mileage on test for this band is 32,648 miles — high-mileage wear items are a recurring theme.
Best band to buy: 2021+ (94.7% first-time pass). Worst band to avoid: 2018-2020 (89.7% pass). That's a 5.0-point spread across 650 older tests and 1,043 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
Bosch Aerotwin wiper blades
Cheap wipers fail the test on smear streaks. Bosch Aerotwins last a winter and clear a screen properly.
Search Amazon UK
My Motor World · affiliate
Affiliate links — small commission, no extra cost to you.
Click Mechanic · affiliate
Affiliate links — small commission, no extra cost to you.
Mobile mechanic · UK-wide
Book a mechanic at your door.
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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 Glb 220 Amg Line Prem + D 4M A 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.
