MOT advisories, minor, major and dangerous defects
By Plateworthy · Updated · Editorial policy
A pass does not mean the MOT history is empty. Read the result and the defect type together, then ask what happened after the test rather than assuming every issue has been repaired.
Keep the official defect labels
Dangerous and major defects cause a test to fail. Minor defects do not cause failure on their own. An advisory records an issue the tester thinks should be monitored or addressed. Preserve these distinctions when reading a timeline; a non-dangerous item is not automatically just an advisory.
A test pass records the inspection outcome at that time. It does not certify current roadworthiness, all mechanical systems or the quality of a subsequent repair.
Look for a sequence, not one alarming line
Read the entries in date order. A recurring tyre advisory followed by a recorded replacement invoice tells you more than a single line in isolation. Conversely, an advisory disappearing from a later test is not itself an invoice or repair certificate.
Ask when work was done, who did it and whether the invoice identifies the car, mileage and parts. Different descriptions or locations can refer to different components; do not assume every repeated word is the same unresolved fault.
Compare the expiry and mileage dates
A historic passing certificate can be expired today. Check the current status separately from the last result, and note when the data was retrieved. If an outage forces an older cached record, verify the current position through the official service.
Mileage without a usable unit or date cannot establish a trend. A lower reading needs investigation, including unit changes, input errors or documented instrument replacement, rather than an immediate fraud accusation.
Before the test drive
Ask the seller to address and document safety concerns before you travel or drive. If the car has a dangerous defect or its legal status is unclear, use the official guidance and an independent professional rather than relying on a seller's reassurance.
A useful viewing checklist separates observed condition, recorded history and unanswered questions. A report supports that process; it does not replace it.
Common questions
- Does an advisory mean the car failed?
- An advisory alone does not cause failure. Read the test's pass/fail outcome and each item's official defect type, then ask what action followed.
- Does a later pass prove a repair was completed?
- It records the later inspection outcome, not the full repair history. Ask for invoices or specialist evidence if the repair matters to your decision.
Sources and further checks
Primary guidance checked for this update. Rules and individual circumstances can change; use the linked official service or advice where a decision depends on it.