Key takeaways
A used car inspection checklist takes you from the paperwork to the test drive in a fixed order, so nothing gets skipped. This one has 47 points in eight groups: history, body, tires, engine bay, interior, underside, test drive and the last steps before you pay. Do it in daylight on a cold engine, then have an independent mechanic check what you cannot see.
- 01Run the VIN for recalls, theft and title brands before you travel to see the car.
- 02Inspect in daylight, when the car is dry and the engine is cold.
- 03Scan for codes and readiness monitors. Several "not ready" monitors can mean the codes were cleared recently, New York's DMV notes.
- 04A vehicle history report is not a substitute for an independent inspection, according to the FTC's advice on buying from a dealer.
This guide belongs to our Used car buying guide: inspection section, which covers the wider topic.
What to Bring and How Long It Takes
You need no special skills, only daylight, dry weather, a cold engine and enough time.
Plan on about 90 minutes: roughly an hour for the walk-around and at least 20 minutes on the road. Ask the seller not to start the car before you arrive. This post expands the inspection section of our used car buying guide into 47 numbered points.
- A flashlight
- A penny, for the tread test
- An OBD2 scanner
- A rag, for the dipsticks
- The listing, to compare with the car
- A friend, to watch the lights
Do points 1 to 4 from home
They need only the VIN. Ask the seller for it before you travel, and skip the trip if the history fails.
Paperwork and History (Points 1 to 7)
Start with the car's record. A history report comes before the inspection, not instead of it.
1. Decode the VIN. Put the VIN in the VIN decoder. A year, engine or trim that differs from the listing needs explaining. See how to read a VIN.
2. Check for open recalls. NHTSA's recall lookup shows unrepaired recalls on this exact car. Dealers fix them for free, but most recalls over 15 years old are left out. See check recalls by VIN.
3. Run the free theft and salvage check. NICB's VINCheck lookup shows, for free, whether participating insurers reported the car stolen and not recovered, or as salvage or flood damaged.
4. Read a history report. Look for title brands, accidents and mileage that goes backward. NMVTIS vehicle history reports cover the title, brand history and latest odometer reading. More: reading a Carfax report and free history checks.
Free tool
VIN Decoder. Decode the VIN to confirm that the year, make, model and engine match the listing.
5. Match the VIN on the car. The VIN at the lower left of the windshield should match the door jamb label and the title exactly. A mismatch is a walk-away sign.
6. Check the title. The name should match the seller's photo ID. Look for a salvage, rebuilt or flood brand and for a listed lender. See title red flags.
7. Compare the mileage records. Compare the odometer with the title, service records and oil change stickers, as NHTSA's odometer fraud guidance advises. Mileage that drops between records is a bad sign.
Body, Tires and Under the Hood (Points 8 to 26)
Walk around the car twice: once from a few steps back, once up close.
Exterior and body, points 8 to 14
8. Panel gaps. Compare the gaps around the hood, doors and trunk, left against right. Uneven gaps suggest a replaced panel or a past crash.
9. Paint match. Sight along each side. A panel that differs in color or texture, or overspray on rubber seals, points to a repaint.
10. Rust. Check the wheel arches, rocker panels, door bottoms and trunk floor. Bubbling paint means rust underneath.
11. Windshield and glass. Look for chips and cracks in every window. A windshield crack tends to spread, so price in a replacement.
12. Lights and lenses. Have your helper confirm every exterior light works. Moisture inside a lens means a failed seal.
13. Doors, hood and trunk. Open and close each one. A door that drops, sticks or needs a slam can point to past damage.
14. Stance. On level ground the car should sit level. A sagging corner points to a worn or broken spring.
Tires and wheels, points 15 to 19
15. Tread depth. Put a penny in the tread, Lincoln's head down. If you can see the top of his head, replace the tire. NHTSA's tire safety guidance says tread worn to 2/32 of an inch is not safe.
16. Wear pattern. Check the full width of each tire. Wear on one edge only points to an alignment or suspension problem.
17. Tire age. The last four digits of the DOT number on the sidewall give the week and year made. Some manufacturers recommend replacement at six to 10 years.
18. Matching set. All four should match in size, ideally in brand. NHTSA says a car showing 20,000 miles or less should have its original tires.
19. Sidewalls and wheels. Cuts, cracks or bulges in a sidewall mean the tire must be replaced. Check the rims for bends and curb damage.
Under the hood, points 20 to 26
Check before the engine runs, and never open a hot radiator cap.
20. Cold engine. Feel the hood first. A warm engine means the seller ran it, which can hide a rough cold start.
21. Engine oil. Pull the dipstick. Oil below the minimum mark shows neglect. Milky oil can mean coolant in the engine.
22. Coolant. Check the overflow tank. An oily film or rusty brown color is a bad sign.
23. Transmission and brake fluid. Dark transmission fluid with a burnt smell is a warning. Brake fluid should sit between the marks on its reservoir.
24. Belts and hoses. Look for cracked or frayed belts. Coolant hoses should feel firm, not soft, swollen or brittle.
25. Battery. White or green crust on the terminals or a loose hold-down suggests the battery has been ignored.
26. Leaks and a too-clean bay. Wet oil or coolant on the engine is a leak. A freshly steam-cleaned bay can be hiding one.
Interior, Electronics and Underneath (Points 27 to 38)
Sit in every seat and press every button. Then get down low with the flashlight.
Interior and electronics, points 27 to 34
27. Warning lights at key-on. Turn the key on without starting. Every warning light should come on, then go out once the engine runs. One that never lights may be disabled.
28. Codes and readiness monitors. Plug in a scanner and check any code in the OBD2 code lookup. Several "not ready" monitors can mean codes were cleared or the battery was disconnected recently, according to the New York DMV's readiness monitor guide.
29. Wear against the mileage. Compare the pedals, steering wheel and driver's seat with the odometer. Heavy wear on a low-mileage car is a reason to doubt the reading.
30. Air conditioning and heat. Run full cold, then full hot, at every fan speed. Weak cooling or a noisy compressor means a repair bill.
31. Switches and screens. Work every window, lock, mirror and seat adjuster, then the touchscreen and backup camera. Price any dead switch before you buy.
32. Carpets and smell. Press a hand into each footwell. Damp carpet, a musty smell or heavy air freshener points to a water leak or worse.
33. Seat belts and airbag light. Tug each belt sharply. It should lock, then retract fully. An airbag light that stays on means a system fault.
34. Trunk and spare. Lift the trunk floor and check the spare and jack. Water, rust or sand in the well points to a leak or a flood.
Signs of a flood car
The FTC's list of flood damage signs: mud or sand under the seats or dashboard, rust around the doors, carpet that is loose, stained or mismatched, and a smell of mold or strong cleaning products. Water damage can slowly destroy electrical systems. Walk away.
Underneath, points 35 to 38
No lift needed, only the flashlight.
35. Drips on the ground. Look where the car was parked. Fresh spots of oil, coolant or transmission fluid mean an active leak.
36. Frame and floor rust. Light surface rust is normal on an older car. Flaking metal, holes or fresh undercoating over rough metal is not.
37. Exhaust. Follow the pipe front to back. Holes, heavy rust and black soot at a joint mean leaks.
38. Shocks and rubber boots. Shock absorbers should be dry, not oily. Torn rubber boots at the axles, with grease thrown around, need repair.
Test Drive and Before You Pay (Points 39 to 47)
Drive for at least 20 minutes on a route with a stop sign, a rough street and a stretch of highway. Radio off.
39. Cold start. The engine should fire at once. Blue smoke means burning oil. Thick white smoke that keeps coming can mean coolant in the cylinders.
40. Idle. Let it idle for a minute. The engine speed should hold steady, with no shaking or knocking.
41. Acceleration and shifting. Accelerate gently, then firmly. Slipping, a delay going into gear or a harsh bang is a transmission warning.
42. Braking. On an empty road, brake firmly in a straight line. Pulling, a pulsing pedal or grinding means brake work.
43. Steering at speed. On a straight, flat highway, a pull or a shake in the wheel means alignment, tire or steering wear.
44. Bumps and tight turns. Listen for clunks over a rough patch. Then turn full lock each way in a parking lot. Clicking points to a worn axle joint.
Before you pay, points 45 to 47
45. Book an independent inspection. Have a mechanic you choose inspect the car and write up the needed repairs with a cost estimate. A seller who refuses is a walk-away sign.
46. Read the Buyers Guide. At a dealer, it says whether the car is sold as is or with a warranty. As is means the dealer will not pay for repairs, according to the FTC's guidance on the Buyers Guide. Get every promise written on it.
47. Agree on the out-the-door price in writing. Use the estimate to negotiate one total and check it in the out-the-door price calculator. New fees at signing are a reason to stop. Then finish the paperwork.
Walk-Away Signs
Most faults are a reason to negotiate. These are a reason to leave.
| What you find | Why you leave |
|---|---|
| The VIN on the car does not match the title | The paperwork belongs to another vehicle, or the car carries a VIN taken from one. |
| The seller's name is not on the title | The person selling may not be the owner. |
| A salvage, junk or flood brand the seller did not mention | The car's damage history is being hidden from you. |
| Mud or sand under the seats, a moldy or heavily perfumed cabin | Possible flood damage. |
| Milky oil or oily coolant | Oil and coolant may be mixing inside the engine. |
| A past mileage record higher than the odometer | Possible odometer fraud. NHTSA estimates more than 450,000 vehicles a year are sold with false readings. |
| The seller will not allow an independent inspection | A mechanic might find something. The FTC's advice is to consider another dealer. |
A disclosed title brand is a pricing question. Brand names and rules vary by state, the NMVTIS site notes.
What a Mechanic's Pre-Purchase Inspection Adds
Your checklist screens out the bad cars. A mechanic confirms the good one.
A pre-purchase inspection (PPI) is an in-depth check of a car's main components by a professional mechanic. The FTC calls it a good idea even on a car the dealer has certified. J.D. Power's guide to pre-purchase inspections puts a typical PPI at $132 to $200 before taxes and fees, and the buyer normally pays.
Eyes on what you cannot reach
The mechanic checks the undercarriage for rust and damage, the suspension, the exhaust and the fluids, and reads the computer for trouble codes.
After your checklist, before you sign
Pay once a car has passed your own checks. It matters most on an as-is sale, where the dealer will not pay for repairs afterward.
Your shop, not the seller's
Choose the mechanic yourself. If the car cannot leave the lot, the FTC suggests a mobile inspection service.
Ask for a written report with a cost estimate for every repair. Check the figures in the repair cost estimator, then negotiate or walk away.
Mistakes to Avoid
The checklist only works if you finish it and act on what you find.
- Letting the seller warm up the car. You lose the cold start, when a tired engine shows itself.
- Treating a clean report as a clean car. The FTC says a history report typically will not list mechanical problems.
- Trusting a safety inspection sticker. A safety inspection usually covers only what makes a car unsafe to drive.
- Assuming you can return the car. Federal law does not require dealers to give you three days to cancel, the FTC notes.
- Talking monthly payments before price. Settle the total first, then test the loan in the car payment calculator.
Frequently Asked Questions
What should I look for when inspecting a used car?
Work in order. Check the VIN, recalls and history first, then the body and paint, the tires, the fluids under the hood, the interior and electronics, and the underside. Finish with a test drive from a cold start that includes highway speed and firm braking. If the car passes, pay an independent mechanic for a pre-purchase inspection before you agree on a price.
How long does a used car inspection take?
Plan on about 90 minutes for this checklist: roughly an hour for the walk-around and at least 20 minutes for the test drive. A mechanic's pre-purchase inspection is a separate appointment, so ask the shop how long it needs when you book. Do not let a seller hurry you through either one.
How much does a pre-purchase inspection cost?
A typical pre-purchase inspection costs between $132 and $200 before taxes and fees, according to J.D. Power, and the buyer normally pays. The price varies with your location and with whether you use an independent shop or a dealership. The FTC notes that the fee can help you avoid paying for a car with major problems.
Can I inspect a used car myself without a mechanic?
You can do every point on this checklist yourself with a flashlight, a penny and an OBD2 scanner, and it will screen out many bad cars. It does not replace a mechanic. The FTC says it is always a good idea to pay an independent mechanic to inspect a used car, even one the dealer has certified.
What if the seller will not allow an inspection?
Treat it as a walk-away sign. The FTC's advice is that if a dealer will not allow an independent inspection, you should consider going to another dealer. If the car cannot leave the lot, ask about a mobile inspection service that comes to the dealer, or ask the dealer to bring the car to a shop you choose.
Does a clean history report mean the car is fine?
No. A report shows only what was reported. The FTC says a vehicle history report may list accidents and flood damage but typically will not list mechanical problems. The federal NMVTIS site also warns that a search can come back clean when a record was never reported. Use the report to rule cars out, then inspect the ones that remain.
Sources and References
- Federal Trade Commission. Buying a Used Car From a Dealer
- National Highway Traffic Safety Administration. Check for Recalls: Vehicle, Car Seat, Tire, Equipment
- National Highway Traffic Safety Administration. Tire Safety Ratings and Awareness (TireWise)
- National Highway Traffic Safety Administration. Odometer Fraud
- U.S. Department of Justice. National Motor Vehicle Title Information System (NMVTIS): For Consumers
- National Insurance Crime Bureau. VINCheck Lookup: Free Vehicle History Check
- Federal Trade Commission. How to steer clear of a flood-damaged car (November 2022)
- New York State Department of Motor Vehicles. What Do You Mean My Car's Not Ready?
- J.D. Power. Understanding Pre-Purchase Inspections (February 2025)
Written by
CarTipsMentor Team
Researched from the sources listed above and checked against them before publishing. Nobody paid to be mentioned on this page. It is general information, not advice about your own vehicle.
Published . Last updated .
