Nearly 28% of people who bought a used car in the last decade reported a problem with it afterwards, according to Citizens Advice research from 2024. The most common issues were defective vehicles, undisclosed damage, and mileage that was higher than advertised. Most of those problems could have been spotted, or at least flagged, before money changed hands.
This guide walks you through everything worth checking, in the order you should actually do it.
Before You Even View the Car
Run a Free Reg Check First
You can check the basic details of any car using its registration number at gov.uk, which shows the current MOT status, tax status, SORN marker, and when the MOT expires. It takes two minutes and costs nothing.
What it does not show is the full MOT history, any outstanding finance, or whether the car has been written off. For that, you need a paid history check from a provider like HPI, Cazana, or the DVLA-linked services such as AutoTrader's vehicle check. These typically cost between £10 and £25, which is a small amount against the cost of any used car.
Read the MOT History, Not Just the Current Certificate
The GOV.UK vehicle history service lets you view every MOT result going back years for free. This is worth more than the current certificate alone. Look at whether the car passes first time or fails repeatedly, what the recurring advisories are, and whether the mileage recorded at each test adds up consistently year on year.
A car that shows 42,000 miles on test in 2020 and 38,000 miles on test in 2022 has a mileage discrepancy. The Motor Ombudsman has published case studies where buyers paid for cars advertised at one mileage and received them with hundreds of additional miles already recorded. Checking the MOT history timeline is the easiest way to spot this before you waste a trip.
Advisories are also worth reading carefully. They are not failures, but they tell you what a tester flagged as approaching the limit or worth watching. A repeated tyre advisory across three consecutive MOTs, for example, suggests the owner has been running close to the legal limit for some time.
Check for Outstanding Finance
This is one of the more serious checks and one that only a paid report covers. If a car has outstanding finance on it, the finance company technically still owns part of it. You can buy the car in good faith, and still have it repossessed if the seller defaults.
Some sellers are aware of this and will tell you the finance will be cleared from the sale proceeds. That may be true, but get it in writing before any money moves. A paid HPI or similar check will show whether finance is recorded against the vehicle. If it is, ask the seller for a settlement figure directly from the finance company and confirm that the remaining balance will be paid off at completion.
Check for Write-Off Status
Cars that have been in significant accidents are categorised by insurers on a scale. Category S and N are the ones you are most likely to encounter on the used market. Category S means structural damage that has been repaired; Category N means non-structural damage. Neither automatically makes a car unsafe, but both affect insurance costs, resale value, and what you should be paying. A car sold without disclosing write-off status is a serious issue.
Run a Recall Check
The GOV.UK recall checker at gov.uk/check-vehicle-recall lets you look up outstanding manufacturer recalls by registration number. If a recall is showing, it does not necessarily mean the work has not been done, but it is worth asking the seller for evidence that it was completed. A dealer in a manufacturer-approved scheme should be able to show you this. A private seller may not have the paperwork, but a main dealer or specialist can confirm VIN-level recall completion.
The reason this matters: a 2024 Motor Ombudsman case study involved a £17,000 crossover SUV where a known fault with water getting into injectors had led to recalls on similar variants. The specific car the buyer purchased had not been recalled, and the fault later appeared. Knowing the recall history before you buy gives you the right questions to ask.
When You Go to View the Car
View in Daylight, Dry Weather
This sounds obvious, but it is worth being deliberate about. Rain masks paint defects, poorly lit garages hide panel mismatches, and evening light flattens surface irregularities. If a private seller can only show you the car in the dark or insists on a quick viewing, that is worth noting.
Exterior Checks
Walk the full perimeter slowly. You are looking for panel gaps that are uneven, which can indicate accident repair or poor bodywork work. Panels that should be parallel should be parallel. A front wing that sits 3mm wider than the other is a flag.
Run your hand along panels to feel for rippling beneath the paint that your eye might miss. Look along the length of each panel from a low angle in the light. Spray filler used to disguise dents shows up as a slight variation in surface texture.
Check the paint colour carefully under daylight. Mismatched paint on a door, wing, or boot lid compared to the surrounding bodywork suggests that panel has been resprayed after damage. One resprayed panel is not always a dealbreaker, but undisclosed repair is.
Check the door shuts, bonnet, and boot for consistent gaps all the way around. If the bonnet gaps are wider on one side than the other, ask why.
Tyres
Legal minimum tread depth in the UK is 1.6mm. Tyres approaching that limit need replacing soon, which is a negotiation point if not a dealbreaker. Use a 20p coin to do a rough check: if the outer rim of the coin is visible when inserted into the tread, the tyre may be close to or below the legal limit.
What most guides do not mention is tyre age. A tyre can have perfectly legal tread depth and still be unsafe if it is too old. Tyres degrade internally with age regardless of use, and most manufacturers recommend replacement after six to ten years. The date of manufacture is moulded into the sidewall as a four-digit code in an oval: the first two digits are the week of manufacture, the last two are the year. A tyre showing "2417" was made in the 24th week of 2017. If the tyres are over seven years old, factor in replacement costs.
Under the Bonnet
You do not need to be a mechanic to do basic checks here. With the engine cold, check the oil level on the dipstick: the level should sit between the minimum and maximum markers, and the oil on the stick should be dark brown or black rather than milky or grey. Milky oil can indicate a head gasket issue, which is an expensive repair.
Check the coolant reservoir level and look at the colour. It should be a clear pink, blue, or green depending on the coolant type, not brown or rusty. Check the brake fluid reservoir for level.
Look at the underside of the oil filler cap. A creamy, mayonnaise-like residue inside is another sign of coolant mixing with oil.
Look at the engine surface for patches of oil that suggest a slow leak. A small amount of grime is normal on older cars, but active drips or obvious wet patches around gaskets or hoses are worth noting.
If the car has a cambelt (also called a timing belt) rather than a timing chain, ask when it was last replaced. Cambelts have a service interval, typically around 60,000 to 80,000 miles or five to seven years depending on the model. A snapped cambelt can destroy an engine. Some car models, including certain Vauxhall and Ford diesels, use a wet belt system that runs in oil, which has its own service interval and failure history worth researching for the specific model you are considering.
Diesel Checks
If the car is a diesel, ask about how it is mainly used. Diesels with a diesel particulate filter (DPF) need regular motorway or longer journeys to regenerate the filter properly. A diesel that has mostly done short town trips may have a partially or fully blocked DPF, which costs several hundred pounds to fix and can run into the thousands if the filter needs replacing.
The symptom on a test drive is a lack of power or a warning light. Ask the seller directly about journey types and check for any DPF-related entries in the service history.
Interior Checks
Sit in every seat. Check that seatbelts extend and retract properly. Look at the wear on the driver's seat, pedals, and steering wheel: the degree of wear should be consistent with the mileage on the clock. Heavy wear on a supposedly low-mileage car is a flag.
Turn on every switch, button, and control you can find. Air conditioning, heated seats, electric windows, mirrors, and any infotainment features. Dashboard warning lights should all illuminate briefly when you start the car and then go out. Any that remain on after startup need explaining.
Check the carpets and boot for dampness, which can suggest a water leak. It is worth lifting the boot carpet to look at the spare wheel well or boot floor for signs of rust or water pooling.
The Test Drive
Start the Engine Cold
Ask to arrive before the seller has warmed the car up. Cold starts reveal things that warm starts hide. Blue smoke on startup and then clearing can indicate worn valve stem seals or piston rings. White smoke that clears quickly in cold weather is usually condensation and is normal. White smoke that persists, especially with a sweet smell, can indicate head gasket problems.
Listen for any rattles, ticking, or knocking when the engine is cold. A diesel will always be noisier at cold start, but metallic knocking from the bottom of the engine is concerning.
What to Listen and Feel For While Driving
Drive it on a variety of roads, not just a short loop around the block. You want some open road where you can reach 60mph and brake firmly, and some slower streets with turns.
Check the brakes by accelerating to around 30mph and braking to a stop in a straight line. The car should pull up straight without pulling to one side. A steering wheel that shakes under braking can indicate warped brake discs.
Listen for suspension noise over bumps, particularly clunks or creaks, which can indicate worn bushes or dampers. Push down hard on each corner of the car before you drive: it should bounce once and settle. If it continues bouncing, the shock absorbers are worn.
Test the steering on a quiet straight road: if you let go briefly and the car pulls noticeably to one side, there may be an alignment or suspension issue. A vibration through the steering wheel at motorway speeds can suggest wheel balancing or tracking issues.
Go through all the gears deliberately. The gearbox should engage cleanly without crunching. On a manual, test the clutch by finding a slight hill and pulling away gently in second gear: a clutch that slips rather than biting cleanly is close to the end of its life.
On an automatic, check that gear changes are smooth and that there is no hesitation or shuddering between changes.
What to Check If You're Buying a Used Electric Car
Used EV sales rose 45.7% in 2025 according to SMMT data, so this section matters more than it did a few years ago.
The battery is the most expensive component in an EV and the one thing that none of the standard physical checks will tell you much about. Battery capacity degrades over time and with charging habits, so a battery that tested fine visually can still have lost a meaningful percentage of its usable range.
Some manufacturers, including Renault and Nissan, offer a battery state of health report through their dealer networks or apps. Others require a diagnostic tool. A specialist EV inspection service can read battery data and give you a state of health percentage, which is worth doing on any used EV you are seriously considering.
Ask specifically about rapid charging history. Regular DC rapid charging degrades battery chemistry faster than slower home or workplace charging. Most newer EVs manage this reasonably well, but it is a relevant question for older models.
Check that the charging cables are included: Type 2 and CCS cables can cost over £100 to replace depending on the car. Check whether the car's battery warranty is still active and whether it is transferable to a new owner, as some manufacturers offer this and some do not.
Check whether any subscription-based features or connected services are linked to the previous owner's account, as some cars require a factory reset or dealer handover process to fully transfer digital ownership.
Paperwork to Check Before You Agree Anything
The V5C Logbook
The V5C is the vehicle registration document. It lists the registered keeper, vehicle details, and the DVLA reference number. It is not proof of ownership, but its absence is a red flag.
Check that the name and address on the V5C match the seller and the address you are viewing the car at. If you are viewing at a home address and the V5C shows a different address or name, ask for a clear explanation. A seller who claims to be selling on behalf of someone else or who cannot produce a V5C is a situation to approach carefully.
Check the VIN (vehicle identification number) on the V5C against the plate on the dashboard (usually visible through the windscreen on the driver's side) and the plate stamped into the bodywork, typically in the door jamb or under the bonnet. All three should match. A mismatch can indicate a cloned vehicle, where a legitimate plate has been put on a stolen car.
Service History
Full service history means documented evidence of every service the car has had, ideally with stamps in a booklet or invoices from a garage. Partial service history means some records exist but not all. No service history is exactly what it sounds like.
A gap in service history is not always terminal. It might mean a careful owner serviced it themselves and kept no paperwork, or it might mean several years of no maintenance at all. The difference shows up in the car's general condition, fluid levels, and brake and tyre wear. Weigh it accordingly.
For model-specific checks, it is worth researching the known service intervals for the particular car you are considering before you view it. Some models have gearbox oil changes that are commonly missed, for example, or timing belts that should have been done at a specific mileage. The service history should show evidence of those if they are due.
Keys
Ask how many keys come with the car. A car sold with only one key is not unusual, but replacement keys can cost anywhere from £100 to several hundred pounds depending on the model and whether they have remote locking or proximity entry. Factor that in.
Private Sale Versus Dealer: The Rights Difference
This is one of the most poorly understood parts of buying a used car. According to CTSI polling from 2025, 65% of motorists were unaware of the difference in rights when buying from a dealer compared to a private seller. 43% wrongly believed the rights were the same in both cases.
When you buy from a dealer, you are protected under the Consumer Rights Act 2015. The car must be of satisfactory quality, fit for purpose, and as described. If it develops a fault within 30 days, you have the right to a full refund. Within six months, the dealer must repair or replace it, and the burden of proof is on them to show the fault was not present at the time of sale.
When you buy privately, none of those protections apply. The only legal protection is against misrepresentation, meaning the seller cannot knowingly lie about the car. But if it develops a fault a week after purchase that was not known to the seller, you have very limited recourse.
This does not mean private sales are bad. They are often where the better-value cars are. But it does change the calculation on whether to get an independent inspection, how hard to negotiate on price given the risk, and how much scrutiny to apply to the history checks.
Agreeing the Deal
Do not pay cash if you can help it. A bank transfer leaves a paper trail. Avoid payment apps or wire transfers to a seller you have not met in person or cannot verify. Request a receipt for any private sale that includes the car's registration, mileage, sale price, date, and both parties' details.
For private sales, both you and the seller need to complete the relevant sections of the V5C and send the new keeper slip to the DVLA. You can do this online via the DVLA's service.
Road tax does not transfer with the car, so you will need to tax it before driving it away.
Check that you have insurance in place before you drive the car. Some comprehensive policies will give you third-party cover to drive other cars, but check your policy terms rather than assuming. Temporary cover is available cheaply for a day or more if you need it.
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