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Bmw 520 vs Bmw M240: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Bmw 520
78%
MOT pass rate · 156,398 vehicles
Bmw M240
84%
MOT pass rate · 18 vehicles
Verdict: On MOT pass rate the Bmw 520 (78%) and Bmw M240 (84%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Bmw 520 Bmw M240
MOT pass rate 78% 84% ✓
MOT failure rate 22% 16% ✓
Faults & advisories per test 1.6 0.7 ✓
Dangerous-fault share 3% ✓ 8%
Average mileage 134,460 mi 49,334 mi
Sample size (vehicles) 156,398 18

Most common faults

Bmw 520

  1. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  2. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  3. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Under-trays fitted obscuring some underside components
  6. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Bmw M240

  1. Offside Rear Tyre has a cut but not deep enough to reach the ply or cords (5.2.3 (d) (i))
  2. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Rear Brake pad(s) wearing thin (1.1.13 (a) (ii))
  5. Offside Rear Tyre has a cut in excess of the requirements deep enough to reach the ply or cords (5.2.3 (d) (i))
  6. Nearside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))

Reliability FAQ

On MOT pass rate the Bmw 520 (78%) and Bmw M240 (84%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Bmw 520 report Full Bmw M240 report Most reliable cars

Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.