"It's HPI clear" does a lot of work in used-car adverts. It's meant to close the conversation — the car has been checked, the check came back clean, move on to the test drive.
It shouldn't close anything. A clear check answers one question about a car very well and a completely different question not at all, and the gap between those two is where most disappointing used-car purchases live.
HPI is a registered trademark of cap hpi. The term is widely used generically for any vehicle history check, and that's how it's used here.
What a vehicle history check does show
The check queries several databases at once and returns markers against the registration and VIN.
| What it returns | Source | Why it matters |
|---|---|---|
| Outstanding finance | Subscribing lenders' data | The finance company still owns the car and can repossess it from you |
| Stolen marker | Police National Computer | The car can be seized with no compensation |
| Insurance write-off category | Insurer claims data | Changes value substantially and affects insurability |
| Scrapped marker | DVLA | The car is recorded as destroyed and shouldn't be on the road |
| Import / export records | DVLA | Affects value, spec, and whether the mileage was ever in kilometres |
| Mileage anomalies | National Mileage Register | Readings from MOTs, services, finance applications and trade sources |
| Plate change history | DVLA | Previous registrations — a plate change can be used to distance a car from its history |
| Colour changes | DVLA | A resprayed car; sometimes benign, sometimes hiding accident repair |
| Previous keepers and dates | DVLA | Frequent short ownerships are a signal worth asking about |
| V5C document check | DVLA | Flags logbooks reported stolen |
| High-risk / security watch markers | Various registers | Registered against the vehicle by an interested party |
| Tax and MOT status | DVLA / DVSA | Current status, not history quality |
That's a genuinely strong list, and it covers the failure modes that lose you the entire car rather than a few hundred pounds. Outstanding finance alone justifies the cost — buy a financed car privately and the lender can take it back, leaving you with a civil claim against a seller who has your money and no incentive to answer the phone.
Run one. Always. Nothing below is an argument against it.
Write-off categories, explained
The single most useful thing the check returns, and the one buyers most often misread.
| Category | Meaning | Can it return to the road? |
|---|---|---|
| Cat A | Scrap only. The entire vehicle must be crushed, including parts | No — never |
| Cat B | Body shell must be crushed. Serviceable parts may be salvaged and resold | No — never |
| Cat S | Structurally damaged but repairable. Chassis, crumple zones or suspension mounting points affected | Yes, once repaired |
| Cat N | Non-structural damage but repairable. Cosmetic, electrical, or components — no structural damage | Yes, once repaired |
| Cat C / Cat D | The pre-October 2017 categories, roughly equivalent to S and N respectively. Older cars may still show these | Yes |
Two things about S and N that catch people out.
One — the category describes the damage, not the repair. A Cat N car might have had a stolen-recovered interior replaced to a very high standard. A Cat S car might have been straightened badly by someone working to a budget. The marker tells you the insurer's assessment of the original damage; it tells you nothing about the quality of what happened afterwards.
Two — the write-off decision is economic, not structural. An insurer writes a car off when repair cost approaches or exceeds value. On a fifteen-year-old car worth £1,800, that threshold is reached by a scraped bumper and a broken headlight. The same damage on a two-year-old car wouldn't come close. So a Cat N marker on a cheap older car often means far less than the word "write-off" implies — and a Cat S marker on a newer, valuable car means considerably more.
If you're looking at a recorded write-off, ask for the repair invoices and photographs. That documentation is the difference between a bargain and a liability, and its absence should be treated as an answer.
The six things it doesn't show
Here's the part the providers don't lead with, because it isn't in their data to sell.
One — service history and maintenance quality. The check knows nothing about whether the car has been serviced at all, let alone on schedule with correct parts. A car with a perfectly clear check can have had two oil changes in nine years. This is the single largest gap, and it's the one most likely to cost you money after purchase — full service history is worth 10–25% of a car's value precisely because it addresses a risk the history check doesn't touch.
Two — major interval work. Cambelt, water pump, clutch, gearbox oil, DPF, brake fluid. A clear check on an 80,000-mile car with a 60,000-mile cambelt interval tells you nothing about whether the belt has been changed — and if it hasn't, you're one failure away from a bill that exceeds the car's value. See cambelt change intervals by manufacturer.
Three — unrecorded accident damage. Only insurance claims generate records. A car repaired privately, or repaired below an insurer's write-off threshold, or repaired after a claim the owner chose not to make, leaves no marker at all. Plenty of significantly damaged cars are entirely clear on a history check. Paint depth readings, panel gaps, and mismatched fixings tell you more here than any database will.
Four — mechanical condition. Engine health, gearbox wear, turbo condition, suspension, corrosion, electrical faults. None of it is in the check. This is what an independent pre-purchase inspection is for.
Five — how the car has been used. Track days, sustained towing, ECU remapping, taxi or driving-school use that never made it onto a record, short-journey-only running that destroys a DPF. The check has no view of any of it.
Six — who legally owns the car. The registered keeper on the V5C is the person responsible for the vehicle, not necessarily its legal owner. The finance marker covers the most common case, but not every scenario — and a V5C is not a proof of title.
The finance data gap worth knowing about
One nuance that rarely gets stated plainly: finance data comes from lenders who subscribe to the register. Most mainstream lenders do. Not every lender does.
Smaller finance providers, some logbook loan companies, and certain private arrangements may not appear. Coverage is good but not absolute, and different providers query different data sets — which is why two checks on the same car occasionally return different results.
Practical response: don't treat "no finance found" as a guarantee. Ask the seller directly, in writing, whether there is any finance outstanding, and get it recorded on the receipt of sale. That written declaration is what supports a misrepresentation claim later if the answer turns out to be false. Our documents you need to sell a car in the UK guide includes a receipt template with that declaration built in.
What you can check for free
Before you pay for anything, three free government sources cover a surprising amount:
DVLA vehicle enquiry — tax status, MOT status, make, model, colour, engine size, CO2, date of first registration. Free, instant, by registration. Cross-check the colour and engine size against the advert; a mismatch is worth a question.
DVSA MOT history — every test, every result, every advisory, and the recorded mileage at each one. This is the most valuable free document in a used-car transaction and it does a large part of the mileage-verification job on its own. See the complete guide to checking MOT history and how to spot a clocked car.
DVSA recall check — enter the VIN and see whether there are outstanding manufacturer safety recalls. Free, and worth doing on any car you're considering.
What you can't get free: finance, write-off category, stolen markers, and the National Mileage Register. Those are the paid part, and they're the part that protects you from losing the car entirely.
The two questions
A used car raises two separate questions, and a history check answers precisely one of them.
Is this car legally safe to buy? Does anyone else have a claim on it, is its identity what it appears to be, has it been written off or stolen or scrapped? The history check answers this well. It's a database question and the databases are good.
Is this car mechanically worth buying? Has it been maintained, is the expensive interval work done, is it going to cost me £2,000 in six months? The history check has nothing to say about this. The answer lives entirely in the paperwork the seller hands you — the service book, the invoice pack, the receipts for major work — cross-referenced against the free MOT record for mileage consistency.
"HPI clear" answers the first question. A complete, verifiable service history answers the second. A car that passes one and fails the other is still a bad buy, and it's the more common failure by a wide margin, because it doesn't come with a warning marker attached.
If you're the one selling, this is the asymmetry to exploit. Every seller can say "HPI clear" — it costs a few pounds and says nothing about the car's care. Far fewer can hand over a dated, indexed, mileage-consistent history pack that answers the second question in five minutes. That's what AutoArchive assembles from photographed paperwork: every invoice, MOT and service event extracted into one searchable timeline, exported as a sale-ready PDF with gaps flagged rather than buried. The check protects the buyer. The archive is what earns you the price.
Related reading: how to prove full service history when selling, what documents you need to sell a car in the UK, and digital service record vs paper service book.
The bottom line
Always run a vehicle history check — outstanding finance and stolen markers are the risks that cost you the whole car, and nothing free covers them. But understand what you've bought: a legal and identity report, not a condition report. It won't tell you whether the car has been serviced, whether the cambelt has been changed, whether it's been crashed and repaired without a claim, or how it's been driven. Pair it with the free DVSA MOT history, a proper look at the service documentation, and an independent inspection on anything expensive. Clear on the database and clear as a purchase are different things.