What to Check Before Buying a Used Car

The smartest checks happen before you leave the house. With nothing but the registration, you can run a car history check by reg and rule out most bad cars in ten minutes:

• MOT history - advisories, failures, and whether the recorded mileage adds up.

• True market value - what it’s actually worth in its condition - so you know if the price is fair.

• Service history - a full, documented record is one of the strongest signs of a well-kept car.

• Build & specification - the exact trim, engine and factory options - what the car actually is, not just the model name.

• Mileage consistency - does the odometer story make sense across every recorded test.

• Owners & plate changes - a lot of owners, or a recent plate change, is worth a question.

View the car in daylight and dry weather - rain and dusk hide scratches, dents and dull paint. Then work slowly around it:

• Panel gaps - even and consistent - uneven gaps hint at past accident repair.

• Paint match - different shades panel-to-panel suggest a respray covering something.

• Rust - check arches, sills and door bottoms. Surface rust is cosmetic; structural rust is expensive.

• Tyres - legal tread is 1.6mm (aim for 3mm+), with even wear and matching brands across an axle.

• Glass & lights - windscreen chips spread; condensation inside a light means water is getting in.

The cabin is where a car's real age and history show through, whatever the odometer says:

• Wear vs mileage - a “30,000-mile” car with a shiny wheel, worn pedals and sagging seats is telling you something.

• Warning lights - on ignition every warning light should appear then go out - one that never lights may have been disabled.

• Electrics - windows, locks, climate control, infotainment, heated seats - try every button.

• Smell - damp or musty air can mean water ingress from a leak, or a flood-damaged car.

• Service records - stamps, invoices and cambelt changes that line up with the MOT dates.

Numbers on a screen can't tell you how a car actually runs. This is the part you can't skip:

• Start it cold - a warm engine hides a difficult start. Blue smoke = burning oil, white = head gasket, black = fuelling.

• Check the fluids - oil level and colour, coolant, and no mayonnaise-like gunk under the oil cap.

• Drive it properly - 15+ minutes on mixed roads, radio off - listen for knocks, whines and vibration.

• Gearbox & clutch - smooth changes, a clutch that bites cleanly, no crunching; an auto that shifts without jerking.

• Brakes & steering - the car pulls up straight and tracks straight, with no vibration through the wheel.

The documents are where cloning, theft and a hidden past come unstuck. None of this is visible in the metal:

• The V5C logbook - the seller’s name and address must match. Never buy a car without it.

• VIN match - the VIN on the V5C must match the car (windscreen base, door pillar, under bonnet). A mismatch means cloned or stolen.

• Two keys - replacement keys are surprisingly expensive - factor it in if there’s only one.

• The paper trail - owners and mileage on paper should match the digital MOT record exactly.

Most of Step 1 - decoding the MOT, checking the mileage story, valuing the exact car, and pulling the service history and mileage record - takes seconds with AnalyzeMyCar. Enter the registration and you get:

• Full MOT history, decoded - advisories, failures and mileage consistency in plain English.

• True market value - for the exact car - adjusted for its mileage, specification and condition.

• Mileage & service-history markers - the record checks that aren’t visible on the car.

• AI Visual Assessment - upload photos for part-by-part repair costs, deducted from the value.

See a sample report to know exactly what you get.

A full report is roughly £10 (10 credits), and your first one is free. Against a used-car mistake that can run into thousands, it's the cheapest insurance you'll buy in the whole process. See pricing, or browse real data on any model in CarParc.