Mercedes Benz
2,544 MOT tests analysed. sits above the UK fleet average — here's where Cla 220 Amg Line Premium D As pass, fail, and end up on the retest sheet.
That's 8.9 points above the UK fleet average across our 1,984 tracked models — a confident result.
Pass
86.4%
Pass-after-fix
2.6%
Fail
10.5%
Avg miles
40,828
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 · 2,544 tests
Pass rate is broadly flat across the cohorts — new and old Cla 220 Amg Line Premium D A examples track each other at the test bay.
Pass
86.4%
Fail
11.3%
PRS
1.5%
Avg mileage at test
44,257 mi
Pass
86.4%
Fail
10.0%
PRS
3.3%
Avg mileage at test
38,527 mi
Cohort = vehicle's first-registration year band. Same model, different generations of build.
The picture
Across 498 MOT tests, the Cla 220 Amg Line Premium D A returns 85.9% 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 34,613, 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 →
26–40
out of 50
Filter failures:
Hide categories
Tick a category to hide it from rankings sitewide. Saved in this browser only.
Windscreen or window damaged or seriously discoloured but not adversely affecting driver's view
44 occurrences · 1.7% of tests
A tyre seriously damaged
43 occurrences · 1.7% of tests
Wiper blade defective
39 occurrences · 1.5% of tests
Wiper blade missing or obviously not clearing the windscreen
33 occurrences · 1.3% of tests
Tyre tread depth not in accordance with the requirements
29 occurrences · 1.1% of tests
A tyre cords visible or damaged
28 occurrences · 1.1% of tests
a brake lining or pad worn below 1.5mm
26 occurrences · 1.0% of tests
A tyre seriously damaged
20 occurrences · 0.8% of tests
A lamp with a multiple light source up to 1/2 not functioning
15 occurrences · 0.6% of tests
Windscreen washers not working or not providing sufficient fluid to clear the windscreen
13 occurrences · 0.5% 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
£100–£185
If every one of this Cla 220 Amg Line Premium D 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 →
Try the calculator
Build your own retest budget.
Year-band analysis
First-time MOT pass rate split by registration band. Pass rates barely move across bands here, so the year you buy Mercedes Benz Cla 220 Amg Line Premium D A makes little measurable difference to MOT outcomes.
Best band to buy
86.4%
2018–2020 registration
the 2018–2020 band climbs to 86.4% — a 0.1-point improvement. Failures here are mostly wear items: damaged but not adversely affecting driver's view, 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
86.4%
2021+ registration
On the 2021-on band, the data shows a 86.4% pass rate against a fleet average of 86.4% on the newer band. The main culprits logged at test: blade defective, has a cut in excess of the…, and does not clear the windscreen effectively. Average mileage on test for this band is 38,527 miles — high-mileage wear items are a recurring theme.
Best band to buy: 2018-2020 (86.4% first-time pass). Worst band to avoid: 2021+ (86.4% pass). That's a 0.1-point spread across 1,519 older tests and 1,025 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
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
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
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.
Fixed-price quotes upfront. No garage needed. Click Mechanic sends a vetted local mechanic to you — home, work, or roadside.
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 Cla 220 Amg Line Premium D 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.
