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Lexus Is 300 auto vs Lexus Rx: reliability comparison

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

Lexus Is 300 auto
72%
MOT pass rate · 54 vehicles
Lexus Rx
93%
MOT pass rate · 18,210 vehicles
More reliable
Verdict: On MOT pass rate, the Lexus Rx is the more reliable of the two — 93% pass first time versus 72%. It's one signal among several; check the full breakdown below.

Head to head

Measure Lexus Is 300 auto Lexus Rx
MOT pass rate 72% 93% ✓
MOT failure rate 28% 7% ✓
Faults & advisories per test 1.5 0.8 ✓
Dangerous-fault share 1% ✓ 3%
Average mileage 109,006 mi 56,088 mi
Sample size (vehicles) 54 18,210

Most common faults

Lexus Is 300 auto

  1. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  2. Under-trays fitted obscuring some underside components
  3. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  4. Windscreen has damage to an area less than a 40mm circle outside zone 'A' (8.3.1d)
  5. Windscreen has damage to an area less than a 10mm circle within zone 'A' (8.3.1a)
  6. Offside Front Tyre worn close to the legal limit (4.1.E.1)

Lexus Rx

  1. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  4. Nearside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  5. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Reliability FAQ

On MOT pass rate, the Lexus Rx is the more reliable of the two — 93% pass first time versus 72%. It's one signal among several; check the full breakdown below.

Full Lexus Is 300 auto report Full Lexus Rx 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.