Conduct a systematic 360-degree inspection of a used vehicle — exterior, interior, mechanical, and digital history — before committing to purchase.
Sources: NHTSA "Vehicle Safety" consumer guide; ASE "Pre-Purchase Inspection Standards"; CarFax/AutoCheck "Buyer's Checklist" methodology; Consumer Reports "Used Car Buying Guide" (2023)
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Run the VIN history report first — Pull CarFax AND AutoCheck (they use different databases); check for: accident history, frame/flood/fire damage, odometer rollback flags, title brands (salvage, rebuilt, lemon-law buyback), number of previous owners, service history records, and open safety recalls.
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Check open recalls — Enter the VIN at nhtsa.gov/recalls; any open recall is the seller's responsibility to disclose; unfixed recalls are a safety risk and negotiation lever.
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Inspect the exterior in daylight — Walk the perimeter in direct sunlight at eye level; look for: panel gaps (inconsistent gaps indicate repaired collision damage), paint color mismatches, overspray on trim or rubber seals (sign of respray), ripples in panels, rust bubbles at lower edges, crack in windshield, haze or crazing on lights.
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Inspect under the hood — Engine cold (do not test after a warm-up that hides cold-start problems): check oil level and color (black = overdue, milky = coolant contamination, sign of head gasket failure), coolant level and color, power steering and brake fluid levels, belt condition (cracking, fraying), battery terminal corrosion, any fresh sealants or oil residue on engine surfaces.
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Inspect the interior — Check: all power windows and locks, all lights (interior, exterior, brake, reverse), HVAC on all settings, infotainment functionality, odometer reading vs. VIN history, seat adjustment mechanisms, any water stains or mildew smell (flood damage indicator), cargo area floor/spare tire well for rust or water.
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Inspect the undercarriage — Jack the vehicle or use ramps (with permission): look for frame welds or patch panels (collision/flood repair), rust on frame rails and subframe, oil/fluid leaks on undercarriage components, exhaust system condition, CV boot tears, shock absorber leaks.
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Test drive minimum 20 minutes — Vary conditions: cold-start idle quality, acceleration from stop, highway speed, braking from 60 mph, low-speed turning (listen for CV joint clicks), parking lot at full lock both directions, reverse. Note: any hesitation, misfires, transmission slipping, unusual vibrations, steering pull, brake pedal feel.
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Check tires and brakes — Measure tread depth with a quarter (Lincoln's head disappears = 4/32" — replace soon); check for uneven wear patterns (inside or outside edge wear = alignment/suspension issue; cupping = shock absorber failure). Inspect pads through wheel spokes for remaining thickness.
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Run OBD-II scan — Connect a scanner with the engine running; any stored or pending codes require investigation before purchase; cleared codes still show "incomplete" readiness monitors — a vehicle with many incomplete monitors likely had codes cleared recently to hide problems.
