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2021 Mercedes-Benz CLA: MOT pass rate and common faults

10,089 initial MOT tests in 2025 on cars first used in 2021 · DVSA data · For guidance only · How we count

86.0%passed first time

Share of initial MOT tests passed with no repairs. Repairs made at the test centre count as a fail. 95% range 85.3% to 86.7% (±0.7 points).

That is 1.2 points below the average for all vehicles first used in 2021 (87.2%). These cars were about 4 years old at the test.

Check a specific CLA

Its own MOT history, free.

Failure areas compared with all 2021 vehicles

Compared with all vehicles first used in 2021, failures are more common in tyres (1.5×), and less common in lights and electrics (0.8×) and windscreen, wipers, mirrors (0.6×). Other differences are within the margin of error.

Failed tests with a fault in each area, per 100 tests. The right-hand column shows how many times as often as all vehicles first used in 2021.

  1. Tyres7.4 in 100 tests1.5× compared with 4.8 in 100 for all vehicles first used in 2021
  2. Brakes2.6 in 100 tests– no reliable figure for all vehicles first used in 2021
  3. Lights and electrics2.2 in 100 tests0.8× compared with 2.6 in 100 for all vehicles first used in 2021
  4. Windscreen, wipers, mirrors1.9 in 100 tests0.6× compared with 3.3 in 100 for all vehicles first used in 2021
  5. Suspension0.9 in 100 tests– no reliable figure for all vehicles first used in 2021

All vehicles first used in 2021: the 221 models in our data, 1,754,969 tests (95.9% of all 1,830,830 tests on vehicles first used in 2021). Areas with fewer than 50 failures in a model aren't published, so an area is only compared when that leaves the all-vehicles figure at most 10% short; otherwise it shows –.

Typical mileage at test36,600

Median odometer reading at the 2025 MOT test, in miles. Half had more and half had less.

After an MOT advisory

2021 Mercedes-Benz CLA cars that passed their 2024 MOT first time with an advisory, and what their next MOT found, against similar cars that passed with nothing noted in that area. Only cars first used in 2021.

Tyres

Of 2021 Mercedes-Benz CLA cars that passed their 2024 MOT with a tyre advisory and came back for their next MOT 10–14 months later, 8.9% failed on tyres, against 7.3% of similar cars with nothing noted. Based on 1,319 and 4,477 cars.

  • With a tyre advisory8.9%
  • Similar cars, nothing noted7.3%

Cars not tested again in that window are not included: 20.0% of those with a tyre advisory and 17.9% of the others.

Not enough 2021 Mercedes-Benz CLA cars with a brake advisory to show a figure for this year alone.

Similar cars are the same model, first-use year and mileage band. Areas are the DVSA's top-level groups, so the later fail may not be the fault that was advised. These figures describe what happened to these cars. They don't show what a repair would have changed.

Mercedes-Benz CLA, all first-use years togetherHow we worked this outAll models compared, with the data

What MOT data can't tell you about any 2021 Mercedes-Benz CLA

Outstanding finance, write-offs, theft and plate changes aren't in MOT records. For a particular car, you need a history check.

Compare history checksWhat MOT history doesn't show

Other Mercedes-Benz CLA years

Mercedes-Benz CLA: every year, common faults and what to check

Other cars first used in 2021

Check a 2021 CLA you're looking at