Buying a used car: checklist before signing

Buying a used car requires a minimum of preparation to limit bad surprises. Here is a practical checklist before signing: documents, test drive and points to check.

Documents to check

Check the title (vehicle identity, owner), the lien release (no outstanding financing) and if possible the service history (logbook, invoices). An up-to-date smog check / state inspection is essential: it certifies the vehicle meets minimum standards. For a private sale, insist on a dated, signed bill of sale.

Test drive

Drive the vehicle on city streets and if possible on the highway. Check braking (effectiveness, stability), steering (no play, no pulling), gear changes (smooth, no crunching). Listen for noises (engine, suspension, wheels). Verify that dashboard warning lights turn off after starting (except those meant to stay on). Testing cold then hot helps detect behavioral differences.

Visual checks

Body: rust, repairs, alignment of doors and hood. Tires: wear, age (DOT code), pressure. Fluids: oil level, coolant, brake fluid. Under the hood: leaks, damaged cables or hoses. Interior: wear on steering wheel and gear shift (consistent with mileage), seat condition.

Hidden costs and diagnosis

Budget for a post-purchase maintenance fund (filters, fluids, brake pads if close to wear limit). A diagnostic scan (OBD-II fault code read) or a pre-purchase inspection by a professional can reveal non-visible faults. My Auto Check-up helps you estimate possible repair costs from symptoms or vehicle history.