Used-car pre-purchase inspection checklist

The short answer

Before you sign, check the car's paperwork yourself (VIN, title, recalls, history), test-drive it with a checklist, and then pay an independent mechanic to inspect it. The Federal Trade Commission says it's "always a good idea to pay for an independent mechanic to conduct a mechanical inspection of a used car," and that if a dealer won't allow one, you should consider going to another dealer.

An inspection usually costs a few hundred dollars or less (Cars.com, citing RepairPal, puts the average at $132 to $200). That's small next to a transmission or head-gasket repair, and the findings give you a reason to negotiate or walk away.

Step 1: Check the paperwork before you drive anywhere

Match the VIN. The 17-character VIN on the listing should match the one on the dashboard (visible through the windshield), the driver's door jamb and the title. LotGauge shows the VIN for every car in its results, so you can run the checks below before you visit.

Open recalls. Enter the VIN at NHTSA's recall lookup. Dealers can sell used cars with open recalls; the repair is free at a franchised dealer for that brand, but ask for it to be done before you take delivery.

Title brands. A title marked salvage, rebuilt, flood, junk or lemon changes what the car is worth and whether lenders and insurers will cover it. The U.S. Department of Justice's National Motor Vehicle Title Information System (NMVTIS) lists approved providers that sell low-cost title-brand checks. See salvage vs. rebuilt titles.

History report. A paid history report can show reported accidents, owners and odometer readings. The FTC notes it "typically will not list mechanical problems" and isn't a substitute for an inspection. See clean title vs. accident history.

Buyers Guide. Dealers must display a Buyers Guide on every used car. It says whether the car is sold "As Is - No Dealer Warranty" (the dealer won't pay for problems after the sale) or with a warranty. Get any spoken promise written onto it.

Step 2: Walk around the car

Body and paint: look down each side in good light for ripples, panels that don't quite match in color, uneven gaps between panels, and paint overspray on rubber trim. These can mean body repair, which a history report may not show.

Tires: uneven wear (one edge worn more than the other) can point to alignment or suspension problems. Check that all four are the same brand and size, and look at the date code on the sidewall; old tires may need replacing soon.

Under the hood and car: look for fresh fluid leaks, wet spots under the engine, cracked belts and hoses, and heavy rust on the frame or brake lines.

Flood signs: the Missouri Attorney General's office lists a musty or "over-perfumed" smell, water stains, mud or residue under the carpet and floor mats, in the trunk and around the pedals, and early rust on hard-to-reach parts like upper door hinges, trunk latches and console screws.

Step 3: Test-drive with a checklist

Start the engine cold if you can (ask the seller not to run it before you arrive): rough starts, smoke or noises are easiest to catch then. Make sure every warning light comes on briefly at startup and then goes off.

On the drive, include stop-and-go traffic, a highway merge and a few turns. Notice whether the car pulls to one side, the steering wheel shakes, the brakes pulse or squeal, or the transmission slips, flares or shifts harshly. Try the heat, air conditioning, windows, locks, lights, wipers, infotainment and every seat adjustment.

A check-engine light that was recently cleared can hide a problem. New York's DMV explains that after codes are cleared or the battery is disconnected, the car's emissions "readiness monitors" read "not ready" until it has been driven enough to re-test itself. A mechanic's scan tool will show this; many "not ready" monitors on a car that's supposedly been driven normally is worth asking about.

Step 4: Get the independent inspection

Choose the shop yourself, not one the seller recommends. If the dealer won't let the car leave the lot, the FTC suggests a mobile inspection service or asking the dealer to bring the car to a shop you choose.

Ask the mechanic to put the car on a lift and check the frame and underbody, suspension and steering, brakes (pad and rotor wear), engine and transmission leaks, the cooling system, tires and alignment, the battery, and to scan for stored trouble codes and readiness monitors. For a hybrid or electric car, ask whether they can test the high-voltage battery's health.

Ask for the findings in writing, with rough repair costs. Then decide: walk away, ask the seller to fix things before you sign, or use the repair estimate to negotiate the price down.

Step 5: Put the findings into the numbers

A $900 repair you'll need in the first year is part of the car's real cost. In the LotGauge car payment calculator, lower the vehicle price by what you negotiate, or add the repair to "Other add-ons" if you'll finance it, to see what it does to your monthly cost.

Also check what the dealer adds to the price. LotGauge reads each listing's fine print for fees beyond the doc fee (anti-theft etching, "dealer service" fees, protection packages) and shows them on the car, so you can ask for them to come off at the same time. See what dealer add-ons do to your payment and how to get the out-the-door price.

Sources

Federal Trade Commission, Buying a Used Car From a Dealer. Cars.com, What Is a Pre-Purchase Car Inspection? (October 2024, citing RepairPal). NHTSA, Check for Recalls. U.S. Department of Justice, NMVTIS. Missouri Attorney General, Tips to Avoid Flood-Damaged Cars. New York DMV, What do you mean my car's not ready? Checked November 2026.