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Bmw 3 series vs Bmw 840d xdrive m sport mhev auto: reliability comparison

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

Bmw 3 series
75%
MOT pass rate · 996,044 vehicles
Bmw 840d xdrive m sport mhev auto
85%
MOT pass rate · 273 vehicles
More reliable
Verdict: On MOT pass rate, the Bmw 840d xdrive m sport mhev auto is the more reliable of the two — 85% pass first time versus 75%. It's one signal among several; check the full breakdown below.

Head to head

Measure Bmw 3 series Bmw 840d xdrive m sport mhev auto
MOT pass rate 75% 85% ✓
MOT failure rate 25% 15% ✓
Faults & advisories per test 2.0 0.6 ✓
Dangerous-fault share 2% ✓ 19%
Average mileage 128,558 mi 41,392 mi
Sample size (vehicles) 996,044 273

Most common faults

Bmw 3 series

  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. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  4. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  5. Under-trays fitted obscuring some underside components
  6. Oil leak, but not excessive (8.4.1 (a) (i))

Bmw 840d xdrive m sport mhev auto

  1. Rear Prop shaft flexible coupling slightly deteriorated (6.1.7 (d) (i))
  2. Oil leak, but not excessive (8.4.1 (a) (i))
  3. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Reliability FAQ

On MOT pass rate, the Bmw 840d xdrive m sport mhev auto is the more reliable of the two — 85% pass first time versus 75%. It's one signal among several; check the full breakdown below.

Full Bmw 3 series report Full Bmw 840d xdrive m sport 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.