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Bmw 520 vs Bmw I4 edrive40 m sport: 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 I4 edrive40 m sport
87%
MOT pass rate · 22,564 vehicles
More reliable
Verdict: On MOT pass rate, the Bmw I4 edrive40 m sport is the more reliable of the two — 87% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Head to head

Measure Bmw 520 Bmw I4 edrive40 m sport
MOT pass rate 78% 87% ✓
MOT failure rate 22% 13% ✓
Faults & advisories per test 1.6 0.8 ✓
Dangerous-fault share 3% ✓ 11%
Average mileage 134,460 mi 36,537 mi
Sample size (vehicles) 156,398 22,564

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 I4 edrive40 m sport

  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. Offside Rear Inner Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Offside Rear Tyre has ply or cords exposed (5.2.3 (d) (ii))

Reliability FAQ

On MOT pass rate, the Bmw I4 edrive40 m sport is the more reliable of the two — 87% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Full Bmw 520 report Full Bmw I4 edrive40 m sport 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.