A car check data guarantee is a promise about the data, not about the car. If the provider reports a specific fact wrongly, you relied on that report when you bought, and you lost money as a direct result, the provider compensates you up to a stated limit. It is not insurance on the vehicle. It pays nothing because the clutch failed, and nothing because you overpaid.
Cover applies to a short list of data points, normally outstanding finance, insurance write-off status and police stolen markers. Mileage is sometimes included and sometimes expressly excluded. A claim only works if you ran the check yourself before you bought, kept the report, can evidence a real financial loss, and told the provider inside its time limit. The headline number is a ceiling on what could ever be paid, not a sum anyone receives. Compare guarantees on their exclusions rather than on the figure in the advert.
Providers do not own the underlying records. Finance data comes from lenders reporting agreements to a register. Write-off markers come from insurers. Stolen markers come from police records. Each of those sources can be late, incomplete or wrong, and no provider can fix that at source. A data guarantee is the provider putting money behind its own handling of what it receives. Report a car as finance free when the register said otherwise, and the provider carries the consequence.
That framing explains every exclusion you will read later. Where there was never a record to report, there is nothing to guarantee.
Three data points sit at the centre of almost every guarantee, because these are the failures that cost a buyer thousands on the day rather than hundreds over a year.
| Data point | What goes wrong if it is reported incorrectly |
|---|---|
| Outstanding finance | The lender's claim is attached to the car, not the seller. It can be repossessed after you have paid in full. |
| Insurance write-off | You pay a clean car price for a Cat S or Cat N vehicle and lose the difference when you sell. |
| Stolen marker | The car can be seized and returned to its owner or insurer, with no compensation to you. |
| Mileage discrepancy | Covered by some providers, excluded by others. Check the wording before you assume. |
Two published examples, both read on each company's own site on 3 September 2026. HPI's published guarantee summary gives up to £30,000 where incorrect data affects title, such as theft or outstanding finance, and up to £15,000 for written off vehicles, with condition claims capped at £15,000 or 50% of market value, whichever is lower. A Carpeep report carries a £30,000 data guarantee covering outstanding finance, insurance write-off status and stolen status.
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Guarantees are rarely refused on the headline. They are refused on the conditions, and those are all things you control at the time of purchase.
The clause people miss. Almost every guarantee requires the check to have been bought before the purchase and to have been genuinely relied on. Running a check after something has gone wrong is the most common reason a claim never starts. All competitor terms quoted here were read on the provider's own site on 3 September 2026 and can change.
A guarantee pays your actual direct financial loss, capped at the limit. Buy a £6,000 car with £4,000 of undisclosed finance registered against it and your loss is measured by what that error cost you, not by the number on the homepage. The cap matters only for expensive cars, and some providers scale it down further. HPI's 50% of market value ceiling on condition claims is a headline figure that shrinks once you read the sentence around it.
Ignore the number for a moment and read four things instead.
Which data points are named. A guarantee that lists finance, write-off and theft is telling you exactly where it stands. A guarantee described only as covering "your purchase" is telling you less.
Whether it applies at the price you are paying. Tiers matter. On 3 September 2026, HPI listed a Basic Check at £9.99 without the guarantee, the full hpi check at £19.99 with the £30,000 guarantee, and a MultiCheck of three checks at £29.99. The cheapest option is not always the covered one.
The notification window. This is a genuine difference and worth stating plainly. HPI's published guarantee runs for two years from the date of the check. Carpeep asks to hear from you within 30 days of the report. On that single dimension HPI gives you longer, and if a claim window months after purchase matters to you, that should weigh in the decision.
What sits outside it. Add up the exclusions and see what is left. That remainder is the real product.
It is worth having, and it should not be the reason you choose a provider. The daily value of a check is the information itself. Seeing an active finance agreement, a Cat N marker or a mileage jump before you commit is what saves the money. The guarantee is the backstop for the day the record was wrong.
Carpeep costs £15 flat, with no tiers and no paid upgrades, and every report carries the £30,000 data guarantee. Nothing is held back for a higher tier. If you want to see what sits behind each marker first, read up on the finance check, the write-off check and the stolen car check, then run a full car history check before you pay for any car.
Hidden finance and write-offs won't show up on a test drive.
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