Why Our MOT Pass Rate Score Looks the Way It Does
The score is designed to be a quick signal, not a final verdict. Here is a short explanation of what goes into it and why we apply certain deductions.
Short version
We start with the pass rate from MOT history and then apply small deductions for patterns that typically increase repair cost or failure risk.
What reduces the score (and why)
- High advisories (-10%) Signals likely near-term work.
- Each pass after fail (-5%) Indicates recent fixes after a failed test.
- High-priority defect keywords (-5%) Safety-related risks.
- Mileage inconsistency (-5%) Possible history gaps.
- 100k+ miles (-5%) Higher wear on major components.
- Age 10+ years (-5%) Age-related failure risk rises.
Want the full methodology?
The guide version includes more detail and examples.
Read the full scoring guide