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Volvo Fh version 4 vs Volvo Unknown: reliability comparison

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

Volvo Fh version 4
90%
MOT pass rate · 51 vehicles
More reliable
Volvo Unknown
86%
MOT pass rate · 319,034 vehicles
Verdict: On MOT pass rate, the Volvo Fh version 4 is the more reliable of the two — 90% pass first time versus 86%. It's one signal among several; check the full breakdown below.

Head to head

Measure Volvo Fh version 4 Volvo Unknown
MOT pass rate 90% 86%
MOT failure rate 10% 14%
Faults & advisories per test 0.0 0.7
Dangerous-fault share 4%
Average mileage 772,889 mi 431,427 mi
Sample size (vehicles) 51 319,034

Most common faults

Volvo Fh version 4

No fault breakdown available.

Volvo Unknown

  1. Oil leak, but not excessive (8.4.1 (a) (i))
  2. Nearside Front 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. Parking brake efficiency below requirements (1.4.2 (a) (i))
  5. Service brake efficiency below requirements (1.2.2 (a) (i))
  6. Rear Brake pad(s) wearing thin (1.1.13 (a) (ii))

Reliability FAQ

On MOT pass rate, the Volvo Fh version 4 is the more reliable of the two — 90% pass first time versus 86%. It's one signal among several; check the full breakdown below.

Full Volvo Fh version 4 report Full Volvo Unknown 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.