How to check a second-hand car before buying it: a complete guide

Why is it important to check a car before buying it?

A used car may look immaculate in photographs while concealing repaired damage, inconsistent mileage, mechanical problems, or differences between its actual equipment and the information in the advertisement.

The verification process should begin before you travel to view the car. Analyse the advertisement, request the VIN, and check the vehicle’s available history. Then continue with the documents, physical inspection, test drive, and an inspection at an independent workshop.

No single check can provide every answer. Used together, these steps significantly reduce the risk of buying a problematic car.

Step 1: Analyse the advertisement

Check whether the information provided is complete and consistent:

• the year of manufacture and date of first registration;

• the engine, power output, and transmission;

• the declared mileage;

• the country of origin;

• the service history;

• any accidents or repainted panels;

• the main equipment.

Compare the price with similar cars based on model, year, engine, and mileage. A price significantly below the market average may indicate damage, technical problems, missing documents, or the need for a quick sale.

A limited number of photographs, pictures taken from a distance, or images that avoid certain areas of the car are additional reasons to request more information.

Step 2: Request the VIN

The VIN uniquely identifies the vehicle and, in most cases, consists of 17 characters. It appears in the car’s documents, at the bottom of the windshield, and on various parts of the body.

A genuine seller should provide the VIN before you view the car. An unjustified refusal, repeated delays, or an incomplete VIN are warning signs.

Using the VIN, you can check whether the car’s technical details match the advertisement and whether relevant records exist in its history.

Step 3: Check the car’s history

A vehicle history report can help you eliminate cars with obvious problems before arranging a viewing. Depending on the information available for the vehicle, you may identify:

• damage events and repair estimates;

• previous photographs of the car;

• mileage readings recorded over time;

• service visits and maintenance operations;

• the factory configuration and equipment;

• possible commercial use;

• theft records;

• recall campaigns;

• technical information and estimated market value.

If you find inconsistent mileage, significant damage, or photographs that contradict the car’s current presentation, you can avoid an unnecessary journey and a potentially risky purchase.

A report showing no recorded damage does not guarantee that the car has never been involved in an accident. Repairs completed without an insurance claim or without being recorded in an available source may not appear. For this reason, the report must be complemented by a physical and technical inspection.

Step 4: Compare the report with the advertisement

Simply opening the report is not enough. Compare the information it contains with the seller’s claims.

Pay particular attention to:

• whether the engine and year match;

• whether the advertised equipment appears in the factory configuration;

• whether the mileage readings show a normal progression;

• whether the report contains damage that the seller did not disclose;

• whether previous photographs show the car in a different condition;

• whether there are long periods without records.

A period without data does not automatically prove that the mileage was altered. It only means that no information was identified in the available sources for that period.

Step 5: Check the documents and the car’s identity

When viewing the car, compare the VIN in the report with the number shown in the documents and physically marked on the vehicle.

Check:

• the vehicle identity card;

• the registration certificate;

• the identity of the person or the company details of the seller;

• documents proving the origin of imported vehicles;

• invoices and service documents;

• the number of available keys.

The seller’s details must be consistent with the car’s documents and their legal right to sell it. Do not pay for the vehicle in full if important documents are missing or if you are only promised that they will be provided later.

Step 6: Inspect the bodywork in daylight

The visual inspection should be performed when the car is clean, dry, and ideally in natural light. Rain, darkness, and poorly lit car parks can conceal defects or differences in paint colour.

Look for:

• differences in colour between body panels;

• uneven gaps between the fenders, bonnet, doors, and boot;

• paint marks on seals or plastic components;

• headlights with different manufacturing years;

• bolts showing signs of removal or repainting;

• uneven welds and joints;

• corrosion in unusual areas;

• traces of water or mud in concealed spaces.

A paint thickness gauge can identify repainted panels or areas where body filler has been applied. However, the readings must be interpreted according to the model and the material of each component.

A repainted panel does not automatically make the car a poor choice. What matters is why it was repaired, the quality of the work, and whether any structural components were affected.