One in 11 Used Cars Sold in Britain Has a Faked Mileage

One in every 11 cars checked by vehicle history firm HPI shows a mileage reading that does not add up. Odometer fraud, known as clocking, now costs UK motorists an estimated £800 million a year, and buyers caught out by it typically pay between £2,000 and £5,000 more than the car is actually worth.

The scale of Britain’s hidden mileage problem

HPI’s data comes from millions of vehicle history checks carried out for buyers, dealers and finance companies each year. Cross-referencing recorded mileage against MOT test history, service records and previous ownership data lets HPI flag cars where the numbers do not line up, either a reading that has fallen between two records, which is physically impossible, or one that has risen far more slowly than the car’s condition and history suggest it should have.

The one-in-11 figure represents a 45% rise in flagged discrepancies over the past five years, the highest level of odometer fraud HPI says it has recorded. One in three cars checked has something hidden in its history overall, spanning outstanding finance, previous insurance write-offs and mileage discrepancies together, which means a mileage problem is often only one part of a wider set of facts a seller has chosen not to disclose.

How a car gets clocked, and why it works

Older cars with mechanical odometers could be wound back with basic tools, but most vehicles on the road now use digital displays, which sellers might assume are harder to tamper with. In practice, cheap diagnostic tools capable of rewriting the figure stored in a car’s electronic control unit are widely available online, and altering a digital odometer often takes less time and skill than the mechanical version ever did.

The financial incentive is simple. A three-year-old car showing 30,000 miles commands a noticeably higher price than an identical model showing 60,000 miles, even though the true condition of the two cars, engine wear, suspension bushes, interior trim, could barely differ if the higher-mileage car has been better maintained. Rolling back the display lets a seller claim the higher price without doing anything to the car itself.

Clocking rarely leaves obvious physical evidence. A car with a genuine service history and a car with a falsified one can look identical from the driver’s seat, and unless a buyer specifically checks the mileage against independent records, there is often nothing at the point of sale to raise suspicion.

Certain vehicles attract more attention from clockers than others. Cars popular with high-mileage drivers, including diesel estates, executive saloons and older leased vehicles returning from a three-year contract with 60,000 miles or more on the clock, offer the biggest gap between real and rolled-back mileage, and so the biggest potential profit for anyone willing to alter the reading. Private sales, where there is no dealer name attached to the transaction and no ongoing reputation at stake, carry more risk than a purchase from an established forecourt, though dealers are far from immune, as the mystery shop and clocking data both show.

What a clocked car actually costs you

The £2,000 to £5,000 typical overpayment HPI describes reflects the gap between what a buyer pays, based on a false low mileage, and what the car is actually worth given its real history of use. That gap is only the visible part of the cost. A car with higher real mileage than advertised is also closer to needing expensive work on wearing components, a timing belt, a clutch, suspension bushings, than its odometer suggests, so a buyer misled about mileage can also face repair bills arriving earlier than expected.

Finance and insurance add a further layer of risk. A car bought on the understanding it had covered 40,000 miles but which has actually covered 90,000 could be valued incorrectly on a finance agreement, and an insurer that later finds the true mileage was misrepresented at the point of sale could, in some circumstances, dispute a claim on the policy.

How to check a car’s real mileage before you buy

Start with the free check every buyer has access to. Enter the registration number at gov.uk/check-mot-history and you will see the mileage recorded at every MOT test the car has had going back to 2005, along with the pass or fail result and any advisories noted at each visit. Compare this list against what the seller and the current dashboard display are telling you. A gap where mileage appears to fall, or barely rises across several years even though the car is clearly being used, is a warning sign worth investigating before you go any further.

A paid vehicle history check from a provider such as HPI or a similar service goes further, cross-referencing mileage against finance records, insurance data and previous sale listings the free MOT check does not cover. For a car of any real value, the cost of this check is small compared with the thousands of pounds a clocked vehicle could cost you.

If you are buying privately, ask the seller directly whether the car has ever had finance, an insurance claim, or an accident, and get the answer in writing as part of the sale, even if it is only in a text message or email. A seller confident in the car’s history will have no reason to avoid confirming details you can already see from the MOT record, and a reluctance to answer plainly is itself worth treating as a warning sign. Where possible, arrange to view and test drive the car at the seller’s home address rather than a car park or lay-by, and check that the name on any paperwork matches the address you are visiting.

Ask to see the car’s full service history, ideally stamped by a garage rather than simply written in a booklet, and check that mileage entries in the service book match the MOT record. Look at wear on the driver’s seat bolster, the steering wheel and the pedal rubbers. A car showing 30,000 miles should not have a heavily worn driver’s seat or pedals rubbed smooth, and a mismatch between claimed mileage and physical wear is one of the simplest checks a buyer can make without any tools or paid reports.

If you find after buying a car that its mileage was misrepresented, you have grounds to pursue the seller under the Consumer Rights Act if you bought from a dealer, as misrepresenting mileage counts as supplying a car not as described. Report suspected clocking to Trading Standards through Citizens Advice, and keep every document from the sale, the advert, any written mileage claims and the invoice, as evidence to support a claim.

Deliberately altering a mileage reading to mislead a buyer is a criminal offence under the Fraud Act 2006, alongside any consumer rights claim you might bring against the seller separately. Trading Standards teams have prosecuted individual sellers and small dealer networks over clocked cars in the past, and a formal report can trigger an investigation even where a private civil claim would be too costly or slow to pursue on its own. If several buyers report the same seller or dealership, that pattern makes a wider investigation far more likely than a single isolated complaint.

None of this requires specialist knowledge or expensive tools. A five-minute check against a free government record, a look at the service book, and a moment spent examining the seat and pedals catches the great majority of clocked cars before money changes hands. The rise in reported discrepancies suggests more sellers are trying it, which makes that five minutes more valuable than it has ever been for anyone buying a used car this year.

Sources:

• HPI: Car Clocking, The Road to Ruin
• HPI Check: Mileage discrepancy check
• GOV.UK: Check the MOT history of a vehicle