What a car history check turns up, what each write-off category means for a car you're considering, and which findings should end a sale on the spot.
A used car has a past that its paintwork won't show you. Four things tend to stay hidden, and each one costs a different amount to get wrong.
The order matters. Two of them can cost you the car itself, not just money, so settle those before you pay anything. The other two change what the car is worth rather than whether you keep it. Buyers tend to worry about them the other way round.
The first is money owed on the car. Outstanding finance follows the vehicle rather than the person selling it, which is exactly why it matters to you. The second is damage. Write-off categories explains the whole system, and Cat S and Cat N get guides of their own, because those two are the ones you'll actually meet for sale.
The third is a car that isn't the seller's to sell. Stolen car checks covers what happens to the buyer, which is worse than most people expect. The fourth is a lie about the car itself. Mileage clocking and cloned number plates are both designed to survive a casual look.
New to all this? Start with what a car history check is, then what a V5C does and doesn't prove. Buyers trust the logbook more than any other paper, and it proves less than they think.
The number that can't be swapped is on the car, not the paper. What a VIN is and how to check one covers reading it off the metal. It also covers what a mismatch means.
Safety recalls work differently: they're the manufacturer's problem rather than a previous owner's, and an outstanding recall can be fixed free. Worth checking before you buy, not after.
Some vehicles need extra care. Imported cars, rebuilt and modified cars, motorbikes and used EVs with battery damage each have quirks the standard advice misses.
Running one is the easy part. How to read a car history check sorts the findings by what they cost you. Some end a purchase, some change the price, and some look far worse than they are.
Two questions bracket the check itself. Who owns a car with this plate? comes first, and no service at any price returns a name. Can you insure a Cat S or Cat N car? comes after, and varies by insurer rather than by law.
The costly mistake is checking late. A check takes a minute and answers what no test drive can. A mechanic can tell you the car is sound. Nobody in a driveway can tell you it's still on finance, or that the plates belong to another car.
Yes, you can legally buy and drive an imported car in the UK. The snag is that "imported" stretches from an EU-spec car near-identical to its UK twin, all the way to a 25-year-old JDM grey import that needed its own approval test. Work out which one you're looking at first.
7 minBuy a car wearing a cloned plate and you can end up handling fines for roads you've never driven. Cloning copies a real registration onto a lookalike car. So it's a different problem from theft or clocking. A few things at a viewing usually give it away.
9 minDVLA changed the rules on 26 August 2025 for repaired, restored and modified cars. Most like-for-like repair work no longer gets reported. Big structural changes and electric conversions still do, so a rebuilt car should come with paperwork you can ask to see.
11 minA safety recall means the maker fixes a built-in fault, usually free. The catch is that a used car's new owner isn't contacted automatically. So checking is down to you, before you buy.
9 minYou've found a cheap car with a write-off marker on it. You can insure a Cat S or a Cat N, and both are legal to drive once repaired. Whether it costs you more depends on which insurer you ask. The marker matters most on the day you claim.
9 minDVLA holds the keeper's name and address, and won't hand it over because you're curious. The plate still tells you plenty about the car. Just nothing about the person selling it.
8 minTwo wrecks, welded into one car and sold under a single registration. It's rare, and nobody publishes a reliable count. The checks that catch it cost nothing, and they're worth doing on any cheap car with a thin history.
9 minA V5C proves who is responsible for a car, not who owns it. It stays silent on outstanding finance, write-offs and clocked mileage too. Check it properly all the same, because a VIN that doesn't match or a logbook issued last week tells you plenty.
10 minNumber plates come and go. The VIN is stamped into the car's structure, which is why it's the number worth reading at a viewing. Hold it against the V5C and you'll know whether the car in front of you is the car on the paperwork.
9 minMost guides walk you through what a history check contains. That's a different job from telling you what to do with one. If you have a report in front of you and a seller waiting on a reply, what you need is a way to sort the findings, because they are not all the same weight.
4 minNo check catches everything. A repair the owner paid for privately, with no insurer ever involved, leaves no trace on any database. A paid history check will flag a formal write-off or a reported accident, and there's a fair bit you can spot yourself at the viewing for free.
6 minMost clocked cars give themselves away in one free check: hold the odometer reading against the car's MOT history. Do that before anything else. The other checks cost nothing too, and the law is on your side if you've already been stung.
7 minBikes are a bigger theft target than cars, and frame damage is far more likely to end in a permanent write-off. So run a check on the registration before any deposit changes hands. Then make sure the bike is legal on the licence you actually hold.
6 minHand over cash for a car with finance still owing and the lender's claim follows the car, not the seller. On hire purchase, PCP and conditional sale, the finance company legally owns the vehicle until the final payment lands. Bought one already? You may well be protected.
8 minThe free government check will not tell you whether a car has been written off. That sits on the insurance industry's register, along with outstanding finance and stolen markers. A paid check searches the registration for all of it, plus mileage. Run one before you pay, not after.
6 minNon-structural damage with the chassis left intact: that is a Cat N write-off, and it can legally be repaired and driven again. Plenty are perfectly sound and cheaper because of it. The marker still changes the sums on insurance, finance and what you get back when you sell.
8 minFour letters, and only two of them mean the car can go back on the road. Cat A and Cat B vehicles have to be destroyed. Cat S and Cat N can legally be repaired and driven again, which is why the letter on a listing matters as much as it does.
7 minYou can't run a registration through the police database yourself. A history check will surface a reported-stolen marker, and a handful of checks when you view the car catch most of the rest. Bear in mind that a check only shows what has been reported by the time you run it.
7 minElectric cars get written off after damage a petrol car would shrug off. The battery pack alone is often 30-50% of the value, and few insurers or bodyshops can safely assess a damaged one cheaply. A history check gives you the write-off category. It says nothing about battery health.
7 minSeen "Cat S" on a listing? It means a load-bearing part, the chassis, frame or safety cell, took damage, and the insurer worked out a proper repair would cost more than the car was worth. Repaired properly, it's road-legal. Whether this one was is your question to answer.
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