In short
Book an independent professional before you commit, with the seller’s permission to access the vehicle and carry out the agreed checks. Ask what the report covers, what it cannot cover and how findings will be explained. Keep the findings and gaps in writing, then decide what needs clarification from the seller or a qualified mechanic.
Use the inspection in three stages
- Before bookingCheck the inspector’s independence, experience, access and report format.
- During inspectionHave the car and documents available; keep the agreed scope clear.
- After the reportSeparate observations from estimates and unresolved questions.
Before booking: choose an inspector who works for you
Ask a qualified inspection provider or mechanic what experience they have with the vehicle type and whether they have any connection to the seller. You should be able to speak with the inspector directly, understand the scope before paying and receive the findings in a form you can keep.
If a seller or dealer offers an inspection report, ask who chose the inspector, who the report was prepared for and exactly what it covered. Independence and scope matter; a different label by itself does not tell you what was checked. Decide whether the report answers your questions or whether you need a separate inspection.
Agree the location, time, access and any additional charge before the appointment. Ask the seller in advance to permit the planned road test or diagnostic scan, if those are part of the agreed scope. Do not assume access will be available on the day.
Request the written report format in advance, including which areas the inspector plans to examine. The US Federal Trade Commission advises consumers to arrange an independent mechanic’s inspection and says to request a written report identifying the make, model and VIN, with problems and estimated repair costs. It also cautions that a history report is not a substitute for inspection.
Agree what the inspection includes
There is no single scope that applies to every car, inspector or market. The vehicle’s age, design, powertrain, access and the seller’s permission can affect what is possible. Ask the provider to write down exclusions or access limits so a missing check is not mistaken for a clear result.
For a used electric vehicle, ask whether a battery state-of-health assessment is included, what method and written result you will receive, and whether a separate battery specialist is needed. New Zealand Consumer Protection’s used-car checklist specifically advises an SOH test for used EVs. For hybrids or uncommon models, ask about experience with the relevant systems and record any specialist work outside the agreed scope.
During the inspection: keep the car and evidence together
Give the inspector the exact registration and VIN, plus any seller documents or service invoices you want considered. Ask them to note the identifier they inspected. If the paperwork and vehicle do not match, pause and resolve that separately.
If you attend, ask the inspector to explain important findings in plain language and point to the report entry. Avoid turning a short visit into a substitute for the written report; record the exact question you want answered later.
Write down the odometer reading, unit and date, then compare it with seller documents and available history records. New Zealand Consumer Protection lists inconsistent odometer readings as a used-car check. If readings differ, record the mismatch and ask for an explanation; a discrepancy alone does not establish why it happened.
Read the report by evidence type
Observation
What the inspector directly saw, heard, measured or read. Check the location and context.
Interpretation
What the observation may mean. Ask what evidence supports that explanation.
Estimate
A proposed cost or follow-up. Confirm who prepared it, what it includes and how current it is.
Unknown
A system or area not checked, inaccessible or outside the inspector’s scope. Decide who can answer it.
Use the report to make a list of specific follow-up questions. If it recommends more testing, repair or specialist advice, ask what evidence or document would resolve the uncertainty and who should provide it. A report can describe condition found during that visit; it cannot promise how the vehicle will perform later.
Official guidance by country
United States · FTC
Ask for an independent inspection
The FTC’s used-car buying advice explains why a history report does not replace an inspection and recommends an independent mechanic. It describes what to request in a written report.
Limit: This is buyer guidance, not a universal inspection standard or a promise that every seller must provide access.
Great Britain · DVSA
An MOT is a separate test record
The DVSA MOT guide for Great Britain describes the test as a check of testable items at that time. It says the test is visual and does not involve dismantling.
Limit: Do not treat an MOT pass as a complete mechanical inspection or statement about present condition.
New Zealand · Consumer Protection
A WoF does not establish overall condition
New Zealand Consumer Protection’s pre-purchase guide explains why a Warrant of Fitness is not a full mechanical inspection or crash-protection assessment, and advises buyers to arrange a professional inspection.
Limit: A WoF and a pre-purchase inspection answer different questions; neither should be substituted for the other.
Pre-purchase inspection worksheet
Save this with the report and record what remains unknown.
| Field | Record | Still unknown or next question |
|---|---|---|
| Vehicle | Make, model, year, market, VIN and registration | Any mismatch with the car or documents? |
| Inspector | Name, provider, experience and relationship to seller | Who is responsible for each part of the work? |
| Agreed scope | Checks, access, scan or road test, date and location | What was excluded or unavailable? |
| Report | Date, identifier, areas examined and written findings | Which statements are observations, interpretations or estimates? |
| Odometer | Reading, unit, date and available comparison records | Any mismatch that needs an explanation? |
| Follow-up | Evidence, repair quote or specialist advice requested | Who will answer, and what document should confirm it? |
Sources and what they cover
Official sources checked . The country examples are not a global directory.
- US Federal Trade Commission: buying a used car from a dealer — history report and independent mechanic guidance, plus suggested written-report contents.
- Great Britain DVSA MOT testing guide — scope and method of the separate statutory test.
- New Zealand Consumer Protection: pre-purchase inspections and checks — WoF limits and professional inspection advice.
- New Zealand Consumer Protection: before buying a used car — used-EV battery state-of-health and odometer checks.