Last updated 2026.
Short answer: Checking a used car well comes down to three layers. First, the free checks: decode the VIN, look up open recalls and safety ratings at NHTSA, and run the NICB VINCheck for theft and total-loss. Second, a history report to confirm the title is clean, the odometer is honest, and, on a pricier car, the accident record. Third, an in-person inspection and test drive, ideally with a mechanic. Do the free checks on every car on your shortlist, buy one report on the finalist, and never skip the physical inspection. Here is the full checklist.
Check a VIN: you can run any US VIN on CarWorthIt for a free preview (specifications, open recalls, safety ratings and running costs), with an optional paid report that adds title, salvage, theft and salvage-auction records plus a market valuation.
Layer 1: the free checks (every car)
- Decode the VIN to confirm the year, make, model and engine match the listing.
- Check open recalls and safety ratings at nhtsa.gov.
- Run the NICB VINCheck at nicb.org for reported theft and insurance total-loss.
- Look up running costs (MPG and fuel cost) at fueleconomy.gov.
Layer 2: the history report (the finalist)
Once a car passes the free checks, a paid report confirms the paperwork:
- Title brands: salvage, junk, flood, rebuilt or lemon markers that a clean-looking title can hide across state lines.
- Odometer history: multiple readings over time to catch a rollback.
- Theft and total-loss records.
- Accident history on higher-value cars, where Carfax or AutoCheck's proprietary data is worth the extra cost.
Match the report to the car. An official NMVTIS report (a few dollars) or a budget report like VinAudit ($9.99) or CarWorthIt ($6.99) covers title, salvage, theft and odometer, with a valuation available. Carfax or AutoCheck cost more but add the detailed accident and service history. See Cheapest VIN Check Compared to pick.
Layer 3: the inspection and test drive
| Check | What you are looking for |
|---|---|
| Panel gaps and paint | Mismatched paint or uneven gaps suggest prior accident repair |
| Tires | Uneven wear can mean alignment or suspension problems |
| Fluids | Milky oil, low or burnt fluid, or leaks |
| Electronics | Warning lights, windows, locks, infotainment, cameras |
| Test drive | Cold start, firm acceleration, braking, steering pull, transmission shifts |
| Mechanic inspection | A pre-purchase inspection is the single best money you can spend on a used car |