Blog · Updated August 4, 2026 · 7 min read · By the Miles team
You booked a pre-purchase inspection. Here is what it covers.
An inspection is a mechanic’s opinion of a car on one particular afternoon. It is not a warranty, and not a promise that nothing will go wrong next month. Knowing where that line falls is what lets you act on it.
What a pre-purchase inspection is
A pre-purchase inspection is an independent mechanic’s assessment of a used car, arranged and paid for by the buyer before money changes hands. It commonly takes one to two hours and ends in a written report listing faults, wear items and rough repair costs.
Independent is the word that matters: the shop works for you, not the seller. If you are buying from a dealer, the Federal Trade Commission advises asking whether you can have the car inspected by a mechanic of your choosing, and dealers must display a Buyers Guide saying whether the car carries a warranty or is sold as is.
Before you go, sort out somewhere to keep what you learn. Buyers who end up owning the car usually wish they had kept the report, the receipts and that day’s odometer reading together. A maintenance app such as Miles does the job, and so does a labelled folder.
What the mechanic will check
Shops vary, and a good one tells you their list when you book. A proper inspection puts the car on a lift and covers six things.
- Underneath. Fluid leaks, corrosion, exhaust, suspension and steering, and signs of structural repair such as welds, kinks or fresh underseal in odd places.
- Brakes, tires and steering. Pad and rotor condition, tread depth and wear pattern, tire age, and play in the steering. Uneven tire wear is a cheap clue to an alignment or suspension problem.
- Under the hood. Fluid levels and condition, belts and hoses, battery, cooling system, and whether anything looks recently cleaned to hide a seep.
- Electronics. A scan for stored and pending fault codes, which can reveal a warning light cleared shortly before you arrived.
- A road test. Cold start behaviour, how the transmission shifts, braking, noises at speed, and whether the car tracks straight.
- Body and interior. Panel gaps, paint thickness readings, mismatched trim, and whether the interior wear matches the mileage showing.
Ask for the report in writing, with rough repair estimates against each item. A verbal “it seems fine” is worth little when negotiating.
What an inspection cannot tell you
Most checklists leave this out, and it is the part that costs money. An inspection is a snapshot, and two hours has limits.
- Intermittent faults. A problem that appears once a week in traffic may simply not happen during the road test.
- Internal wear. Conditions inside an engine or transmission are not visible without taking things apart. A mechanic reads the symptoms and the fluid instead, which is useful but is inference rather than sight.
- Remaining life. Nobody can tell you how many months are left in a battery, a clutch or a set of pads. You get a condition, not an expiry date.
- Whether the car was serviced on schedule. An inspection sees the current state, not the history. Only records show whether the oil was changed on time for eight years or twice.
- Title, theft and reported accident history. A separate check. Damage never claimed on insurance never appears on a history report.
Do one free check yourself: put the VIN into the NHTSA recall lookup. It shows unrepaired safety recalls on that vehicle, and a franchised dealer does recall work free of charge. If something turns up, ask the seller to have it done before you collect the car.
How to brief the shop before they start
A mechanic who knows what worries you writes a more useful report than one handed a set of keys. Five minutes on the phone is enough.
- Say what you will use the car for. Short urban trips, a long commute, towing a trailer. Different uses stress different parts and change what matters in the report.
- Pass on anything the seller told you. A recent repair, a noise they mentioned, a warning light that comes and goes. It tells the mechanic where to look first.
- Ask about known issues for that model and year. A shop that sees the marque regularly knows the weak points, and checking them takes minutes.
- Ask for photographs. Most shops will send pictures of corrosion or a leak, useful when negotiating and again later.
The paperwork to ask the seller for
Ask before the inspection, not after, because gaps are worth mentioning to the mechanic. You want receipts with dates and mileages, any recent major work, the number of previous owners, and whether a warranty is still live.
Records matter more than most buyers assume. Two identical cars at the same mileage are not the same purchase if one has a documented history and the other has none. Dated receipts also protect a warranty claim later, covered in did skipping a service void my warranty. No paperwork is not a deal-breaker, but it shifts weight onto the inspection and it should shift the price.
If you buy the car, start its history at handover rather than at the first thing that goes wrong. Log the mileage, the report and any work done straight afterwards. Miles keeps that as a dated photo timeline per vehicle, reminds you by date or mileage, and checks the VIN against NHTSA recalls in the background. It is free for one vehicle; the features page has the detail. A buyer will ask you for the same records in a few years, as in maintenance records to keep when selling a used car.
What to do with the report
Findings on a report are normal. Used cars have wear, so a list of items is not a reason to panic. Sort what comes back into three piles.
- Walk away. Structural or flood damage, a badly repaired collision, an engine or transmission fault the shop cannot price, or a seller whose story no longer matches the car.
- Negotiate. Wear items with a clear cost, such as tires, brakes or a service due shortly. Written estimates keep this conversation short.
- Accept. Cosmetic wear and minor items you were always going to live with.
One group of findings is not negotiable. If the report flags brakes, steering, tires or anything structural, have it seen by a mechanic promptly and before the car is driven regularly, whoever pays. Waiting on those costs more than a repair bill. For the terms in the report, the car maintenance glossary covers most of them.
Frequently asked questions
How long does a pre-purchase inspection take?
Most shops set aside one to two hours and want the car dropped off rather than waiting on it. Ask when you book. A thorough inspection includes time on a lift and a road test, so twenty minutes squeezed between other jobs is not the same work.
Can I get an inspection on a car that is at a dealership?
Usually yes. The Federal Trade Commission advises used-car buyers to ask the dealer whether they can have the vehicle inspected by an independent mechanic of their choosing, either off the lot or on site. A dealer who refuses any independent inspection has told you something useful.
Is a vehicle history report the same as an inspection?
No, and they answer different questions. A history report covers reported accidents, title status and sometimes logged services. An inspection covers the physical condition of the car in front of you. Damage never reported to an insurer will not appear on a report, and a clean report is not evidence that a car is sound.
What if the seller will not allow an inspection?
Treat it as an answer rather than an obstacle. A seller with nothing to hide has no reason to refuse an inspection they are not paying for. If the car is one you really want, offer a mobile inspector who comes to them. If they still refuse, keep looking.