Used car inspection checklist: what to check before you buy

By Don't Buy Blind · Updated November 1, 2026 · Sources listed below

Check the car in this order: paperwork and VIN first, then the outside (paint, panel gaps, glass, tires), under the hood with the engine cold, the inside (every warning light, switch and the A/C), underneath for rust and fresh repairs, and finally a test drive on city streets, the highway and a rough road. Your own check screens out bad cars cheaply. For the one you want to buy, the FTC recommends an independent mechanic's inspection on top.

Before you go: 5 minutes at home

Get the VIN and check that it decodes to the same year, make and model as the ad.
Check open recalls by VIN (NHTSA in the US, Transport Canada or a dealer in Canada). Recall repairs are free at the carmaker's dealers.
Look at the history for title brands, odometer readings and reported accidents.
Plan for daylight and dry weather. Rain and darkness hide dents, paint repairs and leaks.

Paperwork and VIN

Check	What good looks like	Walk away if
Title or ownership	In the seller's name, matching their ID	The name doesn't match, or "it's my cousin's car"
VIN in three places	Dashboard, driver's door sticker and paperwork all match	Any VIN is scratched, covered or different
Money owing	No lien, or the lender confirms how it will be paid off	The seller won't let you check
Service records	Oil changes and repairs with dates and mileage	Mileage on records is higher than the odometer

In Ontario, a private seller must give you the Used Vehicle Information Package (UVIP), which shows Ontario owners and liens. Ontario.ca also tells buyers to confirm the VIN on the car matches the owner's permit.

Check the VIN on the car you're looking at

See where it was built and its model year, then check its title history for salvage, flood, odometer and theft records.

Outside: paint, panels and glass

Paint: look along each side at an angle. Consumer Reports and Carfax both say slightly different color or texture between panels suggests a repaint, often after a crash.
Overspray: check rubber seals, trim and door jambs for paint mist.
Panel gaps: gaps around doors, hood and trunk should be even and match side to side.
Magnet test: a small magnet that won't stick to a steel panel can mean body filler underneath (some panels are aluminum or plastic, so compare both sides).
Doors, hood and trunk: all should open and close smoothly and shut squarely.
Glass and lights: chips and cracks in the windshield, fogging inside headlights.

Tires and brakes

Tread: the FTC's Buyers Guide lists tread depth under 2/32 inch as a defect. Uneven wear across a tire can point to alignment or suspension problems.
Age: the last four digits of the DOT code on the sidewall are the week and year the tire was made (0322 means week 3 of 2022). NHTSA notes that some vehicle and tire makers recommend replacing tires that are 6 to 10 years old, whatever the tread.
Matching: mismatched sizes or brands across an axle are a question for the seller.
Brakes: look through the wheel at the rotors for deep grooves or a heavy lip.

Under the hood (engine cold)

Ask that the car not be warmed up before you arrive. Some problems only show on a cold start.
Fluids: oil level and color on the dipstick, coolant level in the reservoir, no milky residue under the oil cap.
Leaks and stains: wet spots on the engine, and fresh drips under the car after it has been parked.
Belts and hoses: no cracks, fraying or bulges.
Cold start: it should start promptly with no long rattles, smoke or warning lights left on.

Inside

Warning lights: with the key on and the engine off, the dash lights should all light up, then go out once the engine starts. An airbag or check-engine light that never comes on at all is a red flag.
Everything electrical: windows, locks, mirrors, wipers, lights, infotainment, seat heaters.
A/C and heat: cold air within a minute or two, and heat once warm.
Smell and carpet: musty smell, damp carpet or silt under the mats can mean a leak or flood damage.
Wear vs. mileage: a worn steering wheel, pedals or driver's seat on a "low-mileage" car doesn't add up.

Underneath

Consumer Reports suggests looking for kinked structural parts, welding on frame members and fresh undercoating, which can hide recent structural repairs. In salt-belt areas, check the frame, rocker panels, brake lines and subframe for heavy rust. A mechanic with a lift sees this far better than you can.

The test drive

The FTC recommends driving under varied conditions: hills, highway and stop-and-go traffic. Turn the radio off and check:

Smooth shifting with no slips, clunks or flaring revs
Straight tracking with your hands light on the wheel
Firm brakes with no pulling, grinding or pulsing
No knocks over bumps, and no humming that changes with speed
Temperature gauge steady, no new warning lights

Then get a pro to check it

The FTC says a mechanical inspection is different from a safety inspection: a safety check focuses on what makes a car unsafe, not its overall mechanical condition. Ask the mechanic for a written report with repair estimates and the VIN on it. You can use those numbers to negotiate. If a seller won't allow an inspection, the FTC suggests buying elsewhere.

Want it on paper? Our free one-page checklist (PDF) covers the essentials.

Questions

What should I check first on a used car?

The paperwork and VIN. If the name on the title or ownership doesn't match the seller, or the VINs don't match, nothing else matters.

Do I still need a mechanic if I use a checklist?

Yes. A checklist helps you rule cars out. A mechanic, ideally with the car on a lift, finds what you can't see. The FTC recommends an independent inspection before you buy.

How do I tell how old the tires are?

Read the last four digits of the DOT code on the sidewall: the first two are the week, the last two the year. NHTSA says some makers recommend replacing tires 6 to 10 years old regardless of tread.

Sources

General information, not legal advice. Rules change, so check the official source before you rely on a detail.