10 things you must check when buying a used car

Contents

• 10 key checks before buying a car
• Tips for a safe and cost-effective purchase

Buying a used car can be a sensible deal if you approach it systematically: start with the documents and VIN, check the service history and mileage, inspect the body and chassis, run diagnostics and always do a test drive.

A well-planned inspection saves you money, time and safety risks. Even a car that looks "perfect" can hide serious repairs or legal obstacles.

After such surprises, additional payments, unnecessary stress and even legal problems often follow – all of which a good inspection prevents.

10 key checks before buying a car

Before making a final decision to buy a used car, it is important to go through a series of objective checks that reveal the car's real condition. They help uncover hidden defects, manipulations and legal obstacles that are not visible at first glance.

Below you will find 10 key checks that serve as a reliable guide and can be used as a ready checklist at every inspection:

1. Documents and VIN check

Documents are the first filter against fraud:

• Registration certificate (small and large booklet) – check matching owner, make, model, year and power; request a notarized power of attorney if the seller is not the owner;
• VIN number (chassis) – find the VIN on the body and compare it with the registration; look for re-stamping, grinding or signs of tampering;
• Online VIN decoding – use an official VIN decoder to validate factory parameters such as place of manufacture, engine and series;
• Legal encumbrances (pledge/seizure) – check for special pledges or seizures on the vehicle in the Central Register of Special Pledges.

If there are discrepancies at this stage, do not proceed – you risk buying trouble.

2. Service history check

The service history shows how the car has been maintained – often this is more important than the year. Review the service book for genuine stamps, logical dates and mileage. Collect invoices and repair reports for timing belts, clutches, injectors and turbos. For common brands, a dealer may sometimes see warranty visits by VIN.

Traceable history reduces the risk of hidden repairs and gives you a good basis for negotiation.

3. Mileage check

Tampered odometers are widespread in Europe, especially in cross-border trade. To assess whether the mileage is real, check:

• Comparison with wear – steering wheel, pedals, gear lever, seat;
• Documents – service records and technical inspection reports;
• Online traces – mileage in reports and events by VIN.

If there are contradictions, adjust the price significantly or walk away.

4. Check for accidents and repairs

A good exterior appearance does not guarantee a straight body or safe systems. Approach critically and systematically:

• Different shades of paint between panels;
• Uneven gaps around the hood, doors and trunk;
• Signs of disassembly on bolts and clips;
• "Dull" sound when tapping – a sign of filler;
• Airbag – the lamp should light on contact and go out after ignition.

If in doubt, measure the paint thickness. It is a cheap and indicative test.

5. Engine and electronics diagnostics

Many problems are not visible to the naked eye – listening, observation and tools are needed:

• Cold start – ask that the car has been standing. Hard starting, unstable revs or smoke are red flags;
• Noises and vibrations – knocking, rattling, turbo whine, noisy rollers or belts;
• Warning lights – all should light on contact and go out after ignition;
• OBD diagnostics – the scanner will show active and stored faults in the main systems.

A professional inspection and diagnostics before purchase is an investment that often pays off many times.

6. Body and paint condition

Well-preserved bodywork is the basis for a long remaining life. Here's what to look for:

• Differences in gloss and color;
• "Orange peel", runs and specks – signs of poor-quality painting;
• Straightness of the silhouette and even wheel-arch gaps;
• Uneven tire wear – likely geometry problems.

7. Suspension and chassis

The suspension directly affects safety and comfort. Approach in two stages:

• On the spot – rock the car; "bouncing" indicates worn shock absorbers; inspect mounts, control arms and boots;
• On the road – listen for knocking over bumps; the car should not "pull" during braking; at high speed there should be no vibrations in the steering wheel.

8. Interior and electrical equipment

The interior reveals real usage and potential damage from moisture or fire:

• Wear – heavily worn seats and plastics on a "low km" car are suspicious;
• Smells – of damp or burned;
• Electronics – check windows, mirrors, air conditioning, heating, multimedia and central locking.

9. Test drive

The test drive is mandatory – true problems appear on the road. Follow a logical sequence:

• Before moving off – listen to the engine at idle; check gear engagement;
• While driving – smooth acceleration without jerking; smooth shifts, especially for automatics; stable braking "straight"; absence of knocking and "wandering" from the direction;
• After the test – look for leaks underneath and in the engine bay.

If you find more than one or two significant irregularities, it's better to continue the search.

10. Rust and corrosion

Corrosion is more dangerous than a high-wear engine – it affects the structure itself:

• Rocker panels and lower door edges – look for bubbles and swelling;
• Fenders and arches – check the edges from the inside;
• Underbody and chassis – inspect from a pit or lift: longitudinals, beams, jack points, around the tank and exhaust;
• Couplings and clamps – heavy rust indicates aggressive conditions like salt and moisture.

Serious corrosion on load-bearing elements usually makes repair economically unreasonable – walk away.

Tips for a safe and cost-effective purchase

Before the deal, combine several sources for maximum security:

• Legal encumbrances – pledge or seizure – check the vehicle for recorded special pledges in the Central Register of Special Pledges;
• Civil liability insurance and technical inspection – confirm valid liability insurance through the Guarantee Fund;
• Public checks for fines and sanctions – check for outstanding penalties online via the Ministry of Interior portal;
• Check for a stolen vehicle – if in doubt, request a check from the law enforcement authorities;
• Validate VIN parameters – use an official VIN decoder for factory specifications.

When does it make sense to hire a specialist? For more expensive, complex or premium models, for automatics, diesels, 4x4s, well-equipped cars or if you lack sufficient experience.

A comprehensive inspection includes diagnostics, lift inspection, paint measurement and a report – a cost that often pays off many times.

These checks do not replace a technical inspection and test drive, but complement them with legal and factual security.

Buying a used car always carries risk, but a systematic approach minimizes it. If you want to be completely sure of the car's condition, our team is available. At OnDrive we work with certified technicians and professional equipment so you can make a decision based on facts, not assumptions.