How to Check a Used Car Before Buying

Buying a used car without running the right checks is how people end up with a vehicle that is untaxed, has no valid MOT, or is carrying thousands of pounds of hidden debt. Before you hand over any money, you need to verify the car's legal status, its history, and the person selling it to you. The good news is that most of the essential checks are free and take less than five minutes online.

What checks should you run before you even travel to see the car?

Do not wait until you are standing next to the car to start checking it. Run the basic checks from home first. If the car fails any of them, you can save yourself the journey.

Start with a combined MOT and tax check. This will tell you immediately whether the car is taxed and whether it has a valid MOT. If the MOT has expired, the car cannot be legally driven, and you should question why the seller has not renewed it. If the tax has run out, the seller cannot legally drive it to meet you either.

Next, run a full MOT history check. This gives you the complete test record, including every pass, fail, advisory, and the mileage recorded at each test. Look for gaps in the history, repeated failures, and any pattern of advisories that suggest neglect.

Finally, check the car's basic details against the seller's description. The free check will show you the make, model, colour, fuel type, engine size, and first registration date. If the seller has described the car as a different colour or with a different engine, that is an immediate red flag.

How do you verify the V5C and confirm the seller is the registered keeper?

The V5C logbook is the most important document in a used car sale, but it is not proof of ownership. It is proof of registration. The registered keeper is the person the DVLA holds responsible for the vehicle, and that person should be the seller.

Ask to see the V5C before you view the car. Check that the name and address on the document match the seller's identification. If the seller's name is not on the V5C, ask why. Common legitimate reasons include a recently purchased car where the paperwork has not arrived, but you should treat this as a warning sign.

The V5C shows the date of first registration, which is useful for confirming the car's age. It does not show the MOT expiry date or the tax due date. You still need to run the online checks for those.

Look at the V5C carefully for signs of tampering. The document has security features, and any erasures, corrections, or damaged pages should be treated with suspicion. If the seller is reluctant to show you the V5C, end the viewing.

What do the free online checks tell you, and what do they not tell you?

The free checks available on this site pull directly from the DVLA and DVSA databases. They give you the essential legal status of the vehicle, but they have limits.

What the free check tells you:

• Tax status and the date tax is due
• MOT status and expiry date
• Full MOT history, including pass, fail, and advisory records
• Make, model, colour, fuel type, and engine size
• CO2 emissions and first registration date

What the free check does not tell you:

• Whether there is outstanding finance on the car
• Whether the car is insured (that information is only available through askMID)
• Whether the car has been reported stolen
• Whether the car has been written off in the past

These additional checks are available on paid tiers, which are marked as coming soon on this site. For now, if you want to check finance or stolen status, you will need to use a paid service elsewhere. A finance check is particularly important because if you buy a car with outstanding finance, the finance company can legally repossess it.

How do you read the MOT history for patterns of neglect?

The MOT history is not just about whether the car passed or failed. It is about the pattern of results over time.

Start with the most recent test and work backwards. Look at the mileage recorded at each test. The readings should increase steadily. A sudden drop in mileage between tests is a strong sign of clocking, and you can verify this with a mileage check.

Look for repeated advisories on the same component. If brake discs were noted as worn three years ago, and again two years ago, and again last year, the seller has never replaced them. You will be facing that cost soon after purchase.

Also note the number of failures. A car that fails its MOT every year suggests an owner who only fixes what is necessary to get it through the test, rather than maintaining it properly. A car that passes consistently with few or no advisories is far more likely to be reliable.

If the MOT history shows a gap of a year or more, ask the seller why. The car may have been off the road, which is not necessarily a problem, but it could also mean the car was driven without a valid MOT.

What should you look for during the physical inspection?

The online checks tell you about the car's legal status. The physical inspection tells you about its actual condition. You should spend at least 30 minutes examining the car in daylight.

Walk around the car and look at the panel gaps. Uneven gaps between doors, bonnet, and boot can indicate previous accident damage. Look for paint colour mismatches between panels, which suggest respray work. Check the tyres for uneven wear, which can indicate alignment or suspension problems.

Open the bonnet and look at the engine. Check the oil level and condition. Milky oil on the dipstick is a sign of a blown head gasket. Look for coolant leaks, corrosion on battery terminals, and any obvious signs of neglect.

Check the underside of the car for rust, particularly on the sills, floorpan, and suspension mounting points. Surface rust is normal, but holes or flaking metal are serious structural issues.

Check the VIN number on the dashboard and under the bonnet against the V5C. The VIN check is essential because a mismatched VIN can indicate a stolen or illegally modified vehicle. You can run a VIN check to verify the details.

What should you test on the drive?

The test drive is your chance to assess how the car behaves on the road. Do not skip it, and do not let the seller rush you.

Start the engine from cold and listen for unusual noises. A knocking or tapping sound from the engine is a bad sign. Let it idle for a few minutes and check for excessive smoke from the exhaust. Blue smoke indicates burning oil; white smoke can indicate a coolant leak.

During the drive, test the brakes at low and high speed. The car should stop in a straight line without pulling to one side. Listen for grinding or squealing noises. Test the steering for play and ensure the car tracks straight when you release the wheel.

Test the clutch by accelerating in a higher gear than normal. If the engine revs rise without a corresponding increase in speed, the clutch is slipping. Test the gearbox through all gears, including reverse.

Listen for suspension noises over bumps. A knocking sound from the front or rear can indicate worn bushes or shock absorbers. Test the air conditioning, heating, and all electrical systems, including windows, mirrors, and lights.

What red flags should end the viewing immediately?

Some issues are deal-breakers. If you encounter any of the following, walk away, regardless of how good the price seems.

• The seller refuses to show you the V5C or their identification
• The VIN on the car does not match the V5C
• The car has no valid MOT and the seller cannot explain why
• The car is untaxed and the seller expects you to tax it before driving home
• The seller pressures you to pay a deposit before you have completed your checks
• The car shows obvious signs of clocking, such as a worn steering wheel or pedals inconsistent with the stated mileage
• The seller is not the registered keeper and cannot explain the arrangement

If the car has been in an accident, you can check whether it has been recorded as a write-off. Remember that Category S and N write-offs can legally return to the road, but they must be declared to insurers and will significantly reduce the car's value.

What paperwork should you leave with after the purchase?

When you complete the purchase, you must leave with the correct paperwork. Without it, you cannot tax the car or prove your ownership.

The essential documents are:

• The V5C logbook, with the seller's section completed and your details filled in
• A receipt for the sale, showing the date, price, and both parties' names and addresses
• The MOT certificate, if one exists (though the online record is the authoritative source)
• Any service history documents
• The keys, including spares

You must also tax the car before you drive it. Car tax does not transfer with the sale. The seller is entitled to a refund for the remaining full months of tax, and you must tax the car immediately. If you drive it without tax, you face an £80 penalty, which is reduced if paid promptly, and the DVLA can clamp the vehicle.

If you are not driving the car away and it will be off the road, you need to declare a SORN. A SORN means the car cannot be driven on public roads, but it also means you do not need to tax or MOT it while it is off the road.