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Alfa romeo 155 vs Alfa romeo Giulietta: reliability comparison

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

Alfa romeo 155
62%
MOT pass rate · 2,443 vehicles
Alfa romeo Giulietta
78%
MOT pass rate · 37,784 vehicles
More reliable
Verdict: On MOT pass rate, the Alfa romeo Giulietta is the more reliable of the two — 78% pass first time versus 62%. It's one signal among several; check the full breakdown below.

Head to head

Measure Alfa romeo 155 Alfa romeo Giulietta
MOT pass rate 62% 78% ✓
MOT failure rate 38% 22% ✓
Faults & advisories per test 3.0 1.7 ✓
Dangerous-fault share 0% ✓ 5%
Average mileage 112,005 mi 94,927 mi
Sample size (vehicles) 2,443 37,784

Most common faults

Alfa romeo 155

  1. Parking brake: efficiency below requirements (3.7.B.7)
  2. Exhaust emissions carbon monoxide content after 2nd fast idle excessive (7.3.D.3)
  3. Service brake: efficiency below requirements (3.7.B.7)
  4. Exhaust emissions Lambda reading after 2nd fast idle outside specified limits (7.3.D.3)
  5. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  6. Nearside Front Tyre worn close to the legal limit (4.1.E.1)

Alfa romeo Giulietta

  1. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Offside Rear Coil spring corroded (5.3.1 (b) (i))
  4. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Nearside Rear Coil spring corroded (5.3.1 (b) (i))
  6. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Reliability FAQ

On MOT pass rate, the Alfa romeo Giulietta is the more reliable of the two — 78% pass first time versus 62%. It's one signal among several; check the full breakdown below.

Full Alfa romeo 155 report Full Alfa romeo Giulietta 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.