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Bmw 520 vs Bmw M440i xdrive mhev auto: 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 M440i xdrive mhev auto
90%
MOT pass rate · 4,975 vehicles
More reliable
Verdict: On MOT pass rate, the Bmw M440i xdrive mhev auto is the more reliable of the two — 90% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Head to head

Measure Bmw 520 Bmw M440i xdrive mhev auto
MOT pass rate 78% 90% ✓
MOT failure rate 22% 10% ✓
Faults & advisories per test 1.6 0.5 ✓
Dangerous-fault share 3% ✓ 16%
Average mileage 134,460 mi 29,694 mi
Sample size (vehicles) 156,398 4,975

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 M440i xdrive mhev auto

  1. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Nearside Front Tyre has a bulge, caused by separation or partial failure of its structure (5.2.3 (d) (ii))
  6. Nearside Rear Tyre has a cut in excess of the requirements deep enough to reach the ply or cords (5.2.3 (d) (i))

Reliability FAQ

On MOT pass rate, the Bmw M440i xdrive mhev auto is the more reliable of the two — 90% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Full Bmw 520 report Full Bmw M440i xdrive mhev auto 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.